[ERROR] Assembly with name 'Unity.Build.Tests' already exists

Assembly with name 'Unity.Build.Tests' already exists (Packages/com.unity.platforms/Tests/Editor/Unity.Build.Tests/Unity.Build.Tests.asmdef)

Assembly with name 'Unity.Build.Common' already exists (Packages/com.unity.entities/Unity.Build.Common/Unity.Build.Common.asmdef)

there's a lot more examples but you get the idea.

this happens after after updating packages alongside with GUID problems. Unfortunately, unlike the guid problem, I cant seem to find a solution to fix this issue.

 

I Updated the unity platforms package using the package manager, turns out I can just delete the asmdef file in the cache folder to fix the issue

 

I can confirm this!
I have downloaded the TIny3D example projects in 2020.1.0a22.2822, everything works except for building the project. So I though I would update the packages in the manager, after updating everything I am receiving the same error. Seems like that the Unity.build does exist in :
Packages/Build/Editor/Unity.Build
Packages/Unity Platforms/Editor/Unity.Build

(it seems like Project Tiny depends on both package though)

 

By the way, are you building for DOTS? or using the Project Tiny?
I have finally managed to build. I have done the following:
- play around with the previous versions of the Unity Platforms in Package Manager, try several to revert to.
- Build with the Window/Build/Manager and select only the platforms you want to build for, it seems to recompile everything but at least it works.

 

Can I get a solid solution; i.e. steps on how to fix this problem? I can't just start deleting random files. I need some direction. Here are the errors I'm receiving:

Assembly with name 'Unity.2D.Sprite.Editor' already exists (Packages/com.unity.2d.sprite/Editor/Unity.2D.Sprite.Editor.asmdef)

Assembly with name 'Unity.2D.Sprite.Editor' already exists (Assets/com.unity.2d.sprite/Editor/Unity.2D.Sprite.Editor.asmdef)

Assembly with name 'Unity.2D.Sprite.Package.EditorTests' already exists (Packages/com.unity.2d.sprite/Tests/Editor/Unity.2D.Sprite.Package.EditorTests.asmdef)

Assembly with name 'Unity.2D.Sprite.Package.EditorTests' already exists (Assets/com.unity.2d.sprite/Tests/Editor/Unity.2D.Sprite.Package.EditorTests.asmdef)

I have deleted the asmdef. file for one of these and it doesn't seem to be a problem. When I do it to another I get a list of other issues so I just put it back. As of now, my only other solution is to uninstall and reinstall. Any help?

 

Also, I'm doing this form a Mac if that makes any difference.

 

Ok thanks, I'll try there as well.

 

Code (CSharp):

1. {
2.   "dependencies": {
3.     "com.unity.2d.sprite": "1.0.0",
4.     "com.unity.2d.tilemap": "1.0.0",
5.     "com.unity.collab-proxy": "1.2.16",
6.     "com.unity.ide.rider": "1.1.4",
7.     "com.unity.ide.vscode": "1.1.4",
8.     "com.unity.postprocessing": "2.3.0",
9.     "com.unity.progrids": "3.0.3-preview.4",
10.     "com.unity.render-pipelines.universal": "7.1.8",
11.     "com.unity.test-framework": "1.1.11",
12.     "com.unity.textmeshpro": "2.0.1",
13.     "com.unity.timeline": "1.2.10",
14.     "com.unity.ugui": "1.0.0",
15.     "com.unity.modules.ai": "1.0.0",
16.     "com.unity.modules.androidjni": "1.0.0",
17.     "com.unity.modules.animation": "1.0.0",
18.     "com.unity.modules.assetbundle": "1.0.0",
19.     "com.unity.modules.audio": "1.0.0",
20.     "com.unity.modules.cloth": "1.0.0",
21.     "com.unity.modules.director": "1.0.0",
22.     "com.unity.modules.imageconversion": "1.0.0",
23.     "com.unity.modules.imgui": "1.0.0",
24.     "com.unity.modules.jsonserialize": "1.0.0",
25.     "com.unity.modules.particlesystem": "1.0.0",
26.     "com.unity.modules.physics": "1.0.0",
27.     "com.unity.modules.physics2d": "1.0.0",
28.     "com.unity.modules.screencapture": "1.0.0",
29.     "com.unity.modules.terrain": "1.0.0",
30.     "com.unity.modules.terrainphysics": "1.0.0",
31.     "com.unity.modules.tilemap": "1.0.0",
32.     "com.unity.modules.ui": "1.0.0",
33.     "com.unity.modules.uielements": "1.0.0",
34.     "com.unity.modules.umbra": "1.0.0",
35.     "com.unity.modules.unityanalytics": "1.0.0",
36.     "com.unity.modules.unitywebrequest": "1.0.0",
37.     "com.unity.modules.unitywebrequestassetbundle": "1.0.0",
38.     "com.unity.modules.unitywebrequestaudio": "1.0.0",
39.     "com.unity.modules.unitywebrequesttexture": "1.0.0",
40.     "com.unity.modules.unitywebrequestwww": "1.0.0",
41.     "com.unity.modules.vehicles": "1.0.0",
42.     "com.unity.modules.video": "1.0.0",
43.     "com.unity.modules.vr": "1.0.0",
44.     "com.unity.modules.wind": "1.0.0",
45.     "com.unity.modules.xr": "1.0.0"
46.   }
47. }
48.  

 

And to answer your first question, I didn't see a reference to com.unity.build in the manifest. Maybe I overlooked it.

 

Hey, I'm having this error plus a couple more when I downloaded LWRP, some of the assemblies clash and deleting the .asmdef only causes more issues, is there a way to merge existing assemblies?

I've tried several unity versions, re-installed packages, re-installed unity, everything you can think of, still can't resolve the problem.

 

I may have a solution to this, if your experience is anything like mine.

I tried to open a seperate scene from the one I was working on, and Unity 2019.4.6f1 froze. I left it for a while to let it load but it didnt seem to be doing anything so I used Ctrl+Alt+Delete > End Process to exit the editor.
I then used windows explorer to find the scene I was trying to open. I opened the scene from windows explorer, at which point Unity said it was from a "previous version" and wanted to port / update it as if I was opening an older project.
This was a scene that was already in the current project folder created for 2019.4.6f1 so it was strange.

I let it port / update so that it could open the scene I needed. When it did open the Unity editor, it was an empty scene and there were only a few folders, the entire project missing from the project window.

It seemed to have made a new project out of the scene and its folder.
After exiting and opening my actual project, I started getting the "assembly name already exists" errors.
I tried deleting the asmdef files, which cleared the errors from console but when trying to create new scripts, I could not add them to any game objects as it "could not find the reference". Also the asmdef files would return whenever I opened unity again.

I ended up fixing it by figuring out that the editor had created a new package folder and library folder in the folder that housed the scene I was trying to open. Deleting these extra folders (not the real ones in your project root but the extra ones created within existing folder hierarchy) ended up fixing the issue, no errors logged, ability to create scripts, assign them and build came back.

 

Thanks bro that really helped!

 

unity is such a bag of S***

 

Thanks! You saved my day!

 

Only for nonces who can't get their head around it.