Package manager error for unity post processing

suddenly receiving these errors, tried uninstalling and reinstalling but to no avail.

how can I fix this, this happens while trying to build the project.

 

Package manager:

Code (CSharp):

1. {"level":"info","message":"Starting Server","timestamp":"2019-06-20T01:42:16.977Z"}
2. {"level":"info","message":"Health Request received","timestamp":"2019-06-20T01:42:17.186Z"}
3. {"level":"warn","message":"Package folder [C:\\Users\\janan_tan_idatech\\source\\repos\\BimUnity\\BimVR\\Packages\\Microsoft.CSharp.4.0.1] missing package manifest.","timestamp":"2019-06-20T01:42:21.028Z"}
4. {"level":"warn","message":"Package folder [C:\\Users\\janan_tan_idatech\\source\\repos\\BimUnity\\BimVR\\Packages\\Microsoft.Net.Compilers.3.0.0] missing package manifest.","timestamp":"2019-06-20T01:42:21.028Z"}
5. {"level":"warn","message":"Package folder [C:\\Users\\janan_tan_idatech\\source\\repos\\BimUnity\\BimVR\\Packages\\Microsoft.CSharp.4.0.1] missing package manifest.","timestamp":"2019-06-20T01:46:10.084Z"}
6. {"level":"warn","message":"Package folder [C:\\Users\\janan_tan_idatech\\source\\repos\\BimUnity\\BimVR\\Packages\\Microsoft.Net.Compilers.3.0.0] missing package manifest.","timestamp":"2019-06-20T01:46:10.085Z"}
7. {"level":"warn","message":"Package folder [C:\\Users\\janan_tan_idatech\\source\\repos\\BimUnity\\BimVR\\Packages\\Microsoft.CSharp.4.0.1] missing package manifest.","timestamp":"2019-06-20T01:46:10.108Z"}
8. {"level":"warn","message":"Package folder [C:\\Users\\janan_tan_idatech\\source\\repos\\BimUnity\\BimVR\\Packages\\Microsoft.Net.Compilers.3.0.0] missing package manifest.","timestamp":"2019-06-20T01:46:10.108Z"}
9. {"level":"warn","message":"Package folder [C:\\Users\\janan_tan_idatech\\source\\repos\\BimUnity\\BimVR\\Packages\\Microsoft.CSharp.4.0.1] missing package manifest.","timestamp":"2019-06-20T01:46:16.663Z"}
10. {"level":"warn","message":"Package folder [C:\\Users\\janan_tan_idatech\\source\\repos\\BimUnity\\BimVR\\Packages\\Microsoft.Net.Compilers.3.0.0] missing package manifest.","timestamp":"2019-06-20T01:46:16.663Z"}
11. {"level":"warn","message":"Package folder [C:\\Users\\janan_tan_idatech\\source\\repos\\BimUnity\\BimVR\\Packages\\Microsoft.CSharp.4.0.1] missing package manifest.","timestamp":"2019-06-20T01:46:16.811Z"}
12. {"level":"warn","message":"Package folder [C:\\Users\\janan_tan_idatech\\source\\repos\\BimUnity\\BimVR\\Packages\\Microsoft.Net.Compilers.3.0.0] missing package manifest.","timestamp":"2019-06-20T01:46:16.811Z"}
13. {"level":"warn","message":"Package folder [C:\\Users\\janan_tan_idatech\\source\\repos\\BimUnity\\BimVR\\Packages\\Microsoft.CSharp.4.0.1] missing package manifest.","timestamp":"2019-06-20T01:47:29.416Z"}
14. {"level":"warn","message":"Package folder [C:\\Users\\janan_tan_idatech\\source\\repos\\BimUnity\\BimVR\\Packages\\Microsoft.Net.Compilers.3.0.0] missing package manifest.","timestamp":"2019-06-20T01:47:29.416Z"}
15. {"level":"warn","message":"Package folder [C:\\Users\\janan_tan_idatech\\source\\repos\\BimUnity\\BimVR\\Packages\\Microsoft.CSharp.4.0.1] missing package manifest.","timestamp":"2019-06-20T01:47:29.423Z"}
16. {"level":"warn","message":"Package folder [C:\\Users\\janan_tan_idatech\\source\\repos\\BimUnity\\BimVR\\Packages\\Microsoft.Net.Compilers.3.0.0] missing package manifest.","timestamp":"2019-06-20T01:47:29.423Z"}
17. {"level":"warn","message":"Package folder [C:\\Users\\janan_tan_idatech\\source\\repos\\BimUnity\\BimVR\\Packages\\Microsoft.CSharp.4.0.1] missing package manifest.","timestamp":"2019-06-20T01:47:36.438Z"}
18. {"level":"warn","message":"Package folder [C:\\Users\\janan_tan_idatech\\source\\repos\\BimUnity\\BimVR\\Packages\\Microsoft.Net.Compilers.3.0.0] missing package manifest.","timestamp":"2019-06-20T01:47:36.438Z"}
19.  

Editor:

Code (CSharp):

1.  
2. LICENSE SYSTEM [2019620 9:42:16] Next license update check is after 2019-05-16T07:30:42
3.  
4. Built from '2018.2/release' branch; Version is '2018.2.3f1 (1431a7d2ced7) revision 1323431'; Using compiler version '191225831'
5. OS: 'Windows 10  (10.0.0) 64bit' Language: 'en' Physical Memory: 16336 MB
6. BatchMode: 0, IsHumanControllingUs: 1, StartBugReporterOnCrash: 1, Is64bit: 1, IsPro: 0
7. [Package Manager] Server::Start -- Port 58084 was selected
8. ListPackages failed, output: {
9.   "name": "unity-editor",
10.   "version": "5.7.0",
11.   "problems": [
12.     "extraneous: unityeditor-collab-history@0.6.14 C:\\Users\\janan_tan_idatech\\AppData\\Roaming\\Unity\\Packages\\node_modules\\unityeditor-collab-history"
13.   ],
14.   "dependencies": {
15.     "unityeditor-collab-history": {
16.       "version": "0.6.14",
17.       "extraneous": true,
18.       "problems": [
19.         "extraneous: unityeditor-collab-history@0.6.14 C:\\Users\\janan_tan_idatech\\AppData\\Roaming\\Unity\\Packages\\node_modules\\unityeditor-collab-history"
20.       ],
21.       "from": "unityeditor-collab-history.0.6.14.tgz",
22.       "resolved": "file:unityeditor-collab-history.0.6.14.tgz"
23.     },
24.     "unity-editor-home": {
25.       "version": "0.8.42",
26.       "from": "unity-editor-home.0.8.42.tgz",
27.       "resolved": "file:unity-editor-home.0.8.42.tgz"
28.     },
29.     "unityeditor-cloud-hub": {
30.       "version": "0.0.15",
31.       "from": "unityeditor-cloud-hub-0.0.15.tgz",
32.       "resolved": "file:unityeditor-cloud-hub-0.0.15.tgz"
33.     },
34.     "unityeditor-collab-toolbar": {
35.       "version": "0.7.16",
36.       "from": "unityeditor-collab-toolbar.0.7.16.tgz",
37.       "resolved": "file:unityeditor-collab-toolbar.0.7.16.tgz"'AR/TangoARRender' - Pass '' has no vertex shader
38. WARNING: Shader Unsupported: 'AR/TangoARRender' - Setting to default shader.
39. WARNING: Shader Unsupported: 'Hidden/VideoDecodeOSX' - Pass 'Flip_RGBARect_To_RGBA' has no vertex shader
40. WARNING: Shader Unsupported: 'Hidden/VideoDecodeOSX' - Setting to default shader.
41. WARNING: Shader Unsupported: 'Hidden/VideoDecodeAndroid' - Pass 'RGBAExternal_To_RGBA' has no vertex shader
42. WARNING: Shader Unsupported: 'Hidden/VideoDecodeAndroid' - Setting to default shader.
43. Initialize mono
44. Mono path[0] = 'C:/Program Files/Unity/Hub/Editor/2018.2.3f1/Editor/Data/Managed'
45. Mono path[1] = 'C:/Program Files/Unity/Hub/Editor/2018.2.3f1/Editor/Data/MonoBleedingEdge/lib/mono/unityjit'
46. Mono config path = 'C:/Program Files/Unity/Hub/Editor/2018.2.3f1/Editor/Data/MonoBleedingEdge/etc'
47. Using monoOptions --debugger-agent=transport=dt_socket,embedding=1,server=y,suspend=n,address=0.0.0.0:56672
48. Begin MonoManager ReloadAssembly
49. Refreshing native plugins compatible for Editor in 1.80 ms, found 16 plugins.
50. Initializing Unity.PackageManager (PackageManager) v2018.2.3 for Unity v2018.2.3f1
51. Registering precompiled unity dll's ...
52. Register platform support module: C:\Program Files\Unity\Hub\Editor\2018.2.3f1\Editor\Data\PlaybackEngines\MetroSupport/UnityEditor.WSA.Extensions.dll
53. Register platform support module: C:\Program Files\Unity\Hub\Editor\2018.2.3f1\Editor\Data\PlaybackEngines\windowsstandalonesupport/UnityEditor.WindowsStandalone.Extensions.dll
54. Registered in 0.038602 seconds.
55. Registering precompiled user dll's ...
56. Registered in 2.028835 seconds.
57. Refreshing native plugins compatible for Editor in 2.16 ms, found 16 plugins.
58. Preloading 3 native plugins for Editor in 67.15 ms.
59. Mono: successfully reloaded assembly
60. - Completed reload, in  6.015 seconds
61. Registering platform support modules:
62. Registered platform support modules in: 0.395815s.
63. Native extension for Metro target not found
64. Native extension for WindowsStandalone target not found
65. Begin MonoManager ReloadAssembly
66. OnLevelWasLoaded was found on Reporter
67. This message has been deprecated and will be removed in a later version of Unity.
68. Add a delegate to SceneManager.sceneLoaded instead to get notifications after scene loading has completed
69. (Filename: C:\buildslave\unity\build\Runtime/Mono/MonoScriptCache.cpp Line: 343)
70.  
71. Refreshing native plugins compatible for Editor in 1.96 ms, found 16 plugins.
72. Preloading 3 native plugins for Editor in 0.35 ms.
73. Refreshing native plugins compatible for Editor in 2.08 ms, found 16 plugins.
74. Mono: successfully reloaded assembly
75. - Completed reload, in  2.656 seconds
76. Initializing Unity.PackageManager (PackageManager) v2018.2.3 for Unity v2018.2.3f1
77. Registering platform support modules:
78. Registered platform support modules in: 0.162026s.
79. Native extension for Metro target not found
80. Native extension for WindowsStandalone target not found
81. Validating Project structure ... 0.255036 seconds.
82. Refresh: detecting if any assets need to be imported or removed ...
83. GUID [a35efad8797223d499f8c68b1f545dbc] for asset 'Packages/com.unity.postprocessing/PostProcessing/Editor/Unity.Postprocessing.Editor.asmdef' conflicts with:
84.   'Assets/PostProcessing/Editor/Unity.Postprocessing.Editor.asmdef' (current owner)
85. We can't assign a new GUID because the asset is in an immutable folder. The asset will be ignored.
86.  
87. (Filename: C:\buildslave\unity\build\Modules/AssetDatabase/Editor/V1/AssetInterface.cpp Line: 913)
88.  
89. GUID [d60799ab2a985554ea1a39cd38695018] for asset 'Packages/com.unity.postprocessing/PostProcessing/Runtime/Unity.Postprocessing.Runtime.asmdef' conflicts with:
90.  'Assets/PostProcessing/Runtime/Unity.Postprocessing.Runtime.asmdef' (current owner)
91. We can't assign a new GUID because the asset is in an immutable folder. The asset will be ignored.
92.  
93. (Filename: C:\buildslave\unity\build\Modules/AssetDatabase/Editor/V1/AssetInterface.cpp Line: 913)
94.  
95. Refresh: elapses 0.620908 seconds
96. Refreshing native plugins compatible for Editor in 1.93 ms, found 16 plugins.
97. Preloading 3 native plugins for Editor in 0.34 ms.
98.  
99. ----- Total AssetImport time: 0.493407s, AssetImport time: 0.000000s, Asset hashing: 0.000000s [0 B, 0.000000 mb/s]
100.  
101. Refresh completed in 0.808299 seconds.
102. WARNING: Shader Unsupported: 'AR/TangoARRender' - Pass '' has no vertex shader
103. WARNING: Shader Unsupported: 'AR/TangoARRender' - Setting to default shader.
104. WARNING: Shader Unsupported: 'Hidden/VideoDecodeAndroid' - Pass 'RGBAExternal_To_RGBA' has no vertex shader
105. WARNING: Shader Unsupported: 'Hidden/VideoDecodeAndroid' - Setting to default shader.
106. WARNING: Shader Unsupported: 'Hidden/VideoDecodeOSX' - Pass 'Flip_RGBARect_To_RGBA' has no vertex shader
107. WARNING: Shader Unsupported: 'Hidden/VideoDecodeOSX' - Setting to default shader.
108. Warming cache for 10079 main assets: 0.038911 seconds elapsed
109. Initializing Unity extensions:
110. Updating C:/Program Files/Unity/Hub/Editor/2018.2.3f1/Editor/Data/PlaybackEngines/MetroSupport/Managed/UAP/UnityEngine.Networking.dll - GUID: 52a206b72a8f4f749c28d8b18b42dd19...
111. done. [Time: 386.566000 ms]
112. Unloading 3203 Unused Serialized files (Serialized files now loaded: 0)
113. System memory in use before: 242.1 MB.
114. System memory in use after: 240.8 MB.
115.  
116. Unloading 241 unused Assets to reduce memory usage. Loaded Objects now: 3806.
117. Total: 6.638100 ms (FindLiveObjects: 1.220400 ms CreateObjectMapping: 0.305400 ms MarkObjects: 3.723300 ms  DeleteObjects: 1.388100 ms)
118.  
119. Refreshing native plugins compatible for Editor in 3.08 ms, found 16 plugins.
120. Preloading 3 native plugins for Editor in 0.44 ms.
121.  
122. ----- Total AssetImport time: 6.587654s, AssetImport time: 6.073424s, Asset hashing: 0.000000s [0 B, 0.000000 mb/s]
123.  
124. 'C:/Program Files/Unity/Hub/Editor/2018.2.3f1/Editor/Data/UnityExtensions/Unity/UnityHoloLens/Editor/UnityEditor.HoloLens.dll'  GUID: 12fd8a0055b84bb59e84c9835a37e333
125. 'C:/Program Files/Unity/Hub/Editor/2018.2.3f1/Editor/Data/UnityExtensions/Unity/Timeline/Runtime/UnityEngine.Timeline.dll'  GUID: 6a10b2909283487f913b00d94cd3faf5
126. 'Library/FacebookSDK/Facebook.Unity.Arcade.dll'  GUID: bb6b4101ad2c42ec99f064a70c354e3c
127. 'C:/Program Files/Unity/Hub/Editor/2018.2.3f1/Editor/Data/UnityExtensions/Unity/TestRunner/portable/nunit.framework.dll'  GUID: 405b9b51bb344a128608d968297df79c
128. 'C:/Program Files/Unity/Hub/Editor/2018.2.3f1/Editor/Data/UnityExtensions/Unity/GUISystem/Standalone/UnityEngine.UI.dll'  GUID: f70555f144d8491a825f0804e09c671c
129. 'C:/Program Files/Unity/Hub/Editor/2018.2.3f1/Editor/Data/UnityExtensions/Unity/GUISystem/UnityEngine.UI.dll'  GUID: f5f67c52d1564df4a8936ccd202a3bd8
130. 'C:/Program Files/Unity/Hub/Editor/2018.2.3f1/Editor/Data/UnityExtensions/Unity/Timeline/RuntimeEditor/UnityEngine.Timeline.dll'  GUID: 844f815391db42d49455cbf1a7bfc434
131. 'C:/Program Files/Unity/Hub/Editor/2018.2.3f1/Editor/Data/UnityExtensions/Unity/Networking/Standalone/UnityEngine.Networking.dll'  GUID: dc443db3e92b4983b9738c1131f555cb
132. 'C:/Program Files/Unity/Hub/Editor/2018.2.3f1/Editor/Data/UnityExtensions/Unity/UnitySpatialTracking/Runtime/UnityEngine.SpatialTracking.dll'  GUID: ed7343f30e3843b3afda8f8b02669cea
133. 'C:/Program Files/Unity/Hub/Editor/2018.2.3f1/Editor/Data/UnityExtensions/Unity/UnityGoogleAudioSpatializer/Editor/UnityEditor.GoogleAudioSpatializer.dll'  GUID: 4a3ecb1425d14502837abea459cf2b70
134. 'C:/Program Files/Unity/Hub/Editor/2018.2.3f1/Editor/Data/UnityExtensions/Unity/Networking/Editor/UnityEditor.Networking.dll'  GUID: 5f32cd94baa94578a686d4b9d6b660f7
135. 'C:/Program Files/Unity/Hub/Editor/2018.2.3f1/Editor/Data/UnityExtensions/Unity/UnityHoloLens/Runtime/UnityEngine.HoloLens.dll'  GUID: f7b54ff4a43d4fcf81b4538b678e0bcc
136. 'C:/Program Files/Unity/Hub/Editor/2018.2.3f1/Editor/Data/UnityExtensions/Unity/UnitySpatialTracking/Editor/UnityEditor.SpatialTracking.dll'  GUID: b5da970776034f77a070d99423d68791
137. 'C:/Program Files/Unity/Hub/Editor/2018.2.3f1/Editor/Data/PlaybackEngines/MetroSupport/Managed/UAP/UnityEngine.Networking.dll'  GUID: 52a206b72a8f4f749c28d8b18b42dd19
138. 'C:/Program Files/Unity/Hub/Editor/2018.2.3f1/Editor/Data/UnityExtensions/Unity/TreeEditor/Editor/UnityEditor.TreeEditor.dll'  GUID: adebbd281f1a4ef3a30be7f21937e02f
139. 'Library/FacebookSDK/Facebook.Unity.Settings.dll'  GUID: 18b4dbf8a0b54ea4adf46fb7f4d71dd0
140. 'C:/Program Files/Unity/Hub/Editor/2018.2.3f1/Editor/Data/UnityExtensions/Unity/Networking/UnityEngine.Networking.dll'  GUID: 870353891bb340e2b2a9c8707e7419ba
141. 'Library/FacebookSDK/Facebook.Unity.dll'  GUID: 2403d1f95ea54028853403e595bc9274
142. 'C:/Program Files/Unity/Hub/Editor/2018.2.3f1/Editor/Data/UnityExtensions/Unity/TestRunner/UnityEngine.TestRunner.dll'  GUID: 53ebcfaa2e1e4e2dbc85882cd5a73fa1
143. 'C:/Program Files/Unity/Hub/Editor/2018.2.3f1/Editor/Data/UnityExtensions/Unity/UnityGoogleAudioSpatializer/RuntimeEditor/UnityEngine.GoogleAudioSpatializer.dll'  GUID: ead147da21254ff9a0a936bdd75e1680
144. 'C:/Program Files/Unity/Hub/Editor/2018.2.3f1/Editor/Data/UnityExtensions/Unity/UnityGoogleAudioSpatializer/Runtime/UnityEngine.GoogleAudioSpatializer.dll'  GUID: e4f4cf1b9b434137a499903a7a1d651a
145. 'C:/Program Files/Unity/Hub/Editor/2018.2.3f1/Editor/Data/UnityExtensions/Unity/UnityVR/Editor/UnityEditor.VR.dll'  GUID: 4ba2329b63d54f0187bcaa12486b1b0f
146. 'C:/Program Files/Unity/Hub/Editor/2018.2.3f1/Editor/Data/UnityExtensions/Unity/UnityHoloLens/RuntimeEditor/UnityEngine.HoloLens.dll'  GUID: 1c6d1fbb51834b64847b1b73a75bfc77
147. 'C:/Program Files/Unity/Hub/Editor/2018.2.3f1/Editor/Data/UnityExtensions/Unity/UnitySpatialTracking/RuntimeEditor/UnityEngine.SpatialTracking.dll'  GUID: 3a84de5cd0624681b6b6dcd8921d912a
148. 'C:/Program Files/Unity/Hub/Editor/2018.2.3f1/Editor/Data/UnityExtensions/Unity/GUISystem/Editor/UnityEditor.UI.dll'  GUID: 80a3616ca19596e4da0f10f14d241e9f
149. 'C:/Program Files/Unity/Hub/Editor/2018.2.3f1/Editor/Data/UnityExtensions/Unity/TestRunner/Editor/UnityEditor.TestRunner.dll'  GUID: 4113173d5e95493ab8765d7b08371de4
150. 'C:/Program Files/Unity/Hub/Editor/2018.2.3f1/Editor/Data/UnityExtensions/Unity/TestRunner/net35/unity-custom/nunit.framework.dll'  GUID: 4b3fa4bde7f1451a8218c03ee6a8ded8
151. 'C:/Program Files/Unity/Hub/Editor/2018.2.3f1/Editor/Data/UnityExtensions/Unity/Timeline/Editor/UnityEditor.Timeline.dll'  GUID: 7668179ede524d6396c8b7d84461ea29
152. 'Library/FacebookSDK/FacebookNamedPipeClient.dll'  GUID: 51288a4fc4384861a5b1f9dd49b3da26
153. Cannot add menu item 'Assets/Create/Post-processing Profile' for method 'ProfileFactory.CreatePostProcessProfile' because a menu item with the same name already exists.
154. (Filename: C:\buildslave\unity\build\Editor/Src/Commands/ScriptCommands.cpp Line: 159)
155.  
156. Cannot add menu item 'GameObject/3D Object/Post-process Volume' for method 'VolumeFactory.CreateVolume' because a menu item with the same name already exists.
157. (Filename: C:\buildslave\unity\build\Editor/Src/Commands/ScriptCommands.cpp Line: 159)
158.  
159. Load scene 'Assets/Scenes/Splash.unity' time: 0.039800 ms
160. Unloading 987 Unused Serialized files (Serialized files now loaded: 0)
161. System memory in use before: 163.8 MB.
162. System memory in use after: 164.1 MB.
163.  
164. Unloading 917 unused Assets to reduce memory usage. Loaded Objects now: 3938.
165. Total: 4.648900 ms (FindLiveObjects: 1.075600 ms CreateObjectMapping: 0.309400 ms MarkObjects: 3.009900 ms  DeleteObjects: 0.253500 ms)
166.  
167. <RI> Initialized touch support.
168.  
169. <RI> Initialized touch support.
170.  
171. <RI> Initialized touch support.
172.  
173. <RI> Initialized touch support.
174.  
175. <RI> Initialized touch support.
176.  
177. <RI> Initialized touch support.
178.  
179. <RI> Initialized touch support.
180.  
181. <RI> Initializing input.
182.  
183. <RI> Input initialized.
184.  
185. Launched and connected shader compiler UnityShaderCompiler.exe after 0.09 seconds
186. - Starting compile Library/ScriptAssemblies/com.unity.postprocessing.dll
187. - Starting compile Library/ScriptAssemblies/Unity.Postprocessing.Runtime.dll
188. - Starting compile Library/ScriptAssemblies/Unity.TextMeshPro.dll
189. - Starting compile Library/ScriptAssemblies/Unity.Mathematics.dll
190. - Starting compile Library/ScriptAssemblies/Unity.RenderPipelines.Core.Runtime.dll
191. - Starting compile Library/ScriptAssemblies/Unity.Properties.dll
192. - Starting compile Library/ScriptAssemblies/Unity.Burst.dll
193. - Starting compile Library/ScriptAssemblies/SpeckleUnityConverter.dll
194. EditorUpdateCheck: Response {"latestversionstring":"2019.1.7f1 (f3c4928e5742)","latestversion":99999,"latestversionmessage":"A new version of Unity is available. Please update to the latest released version at your convenience. Release notes available on the download site. Click the \"Download Installer\" button.","updateurl":"http://unity3d.com/update/","updateinterval":3600} updateurl = http://unity3d.com/update/ interval = 3600
195. Hub Web Socket connection default:(null):reason:29
196. Hub Web Socket HTTP protocol init
197. Refresh: detecting if any assets need to be imported or removed ...
198. GUID [a35efad8797223d499f8c68b1f545dbc] for asset 'Packages/com.unity.postprocessing/PostProcessing/Editor/Unity.Postprocessing.Editor.asmdef' conflicts with:
199.   'Assets/PostProcessing/Editor/Unity.Postprocessing.Editor.asmdef' (current owner)
200. We can't assign a new GUID because the asset is in an immutable folder. The asset will be ignored.
201.  
202. (Filename: C:\buildslave\unity\build\Modules/AssetDatabase/Editor/V1/AssetInterface.cpp Line: 913)
203.  
204. GUID [d60799ab2a985554ea1a39cd38695018] for asset 'Packages/com.unity.postprocessing/PostProcessing/Runtime/Unity.Postprocessing.Runtime.asmdef' conflicts with:
205.  'Assets/PostProcessing/Runtime/Unity.Postprocessing.Runtime.asmdef' (current owner)
206. We can't assign a new GUID because the asset is in an immutable folder. The asset will be ignored.
207.  
208. (Filename: C:\buildslave\unity\build\Modules/AssetDatabase/Editor/V1/AssetInterface.cpp Line: 913)
209.  
210. Refresh: elapses 1.184883 seconds
211. Refreshing native plugins compatible for Editor in 66.39 ms, found 16 plugins.
212. Preloading 3 native plugins for Editor in 0.46 ms.

 

Hey @okcompute_unity

Thanks so much for helping, you guided me to the solution.

I had to check out what UPM is and RE-realised the power of the log files.

Leading to the understanding that that was a problem with the package manager.

And finally a deeper googling with the help of the log file led to this solution:
https://forum.unity.com/threads/package-manager-is-missing.557854/

Finally compiled after I reset the package manager to defaults.

Thanks @okcompute_unity !! I appreciate your guidance!