Error: Asset dissapeared while building player

Hello,

I started seeing when i press the build button it doesnt do anything, sometimes it just pops back up and does nothing.

Using 2018.2 I keep getting build error that an asset has disappeared while building to 'sharedassets5.assets' path Assets/Resource/blank.png instanceID 73168

and also this error

NullReferenceException: (null)
UnityEditor.SerializedObject..ctor (UnityEngine.Object[] objs) (at C:/buildslave/unity/build/Editor/Mono/SerializedObject.cs:21)
UnityEditor.Experimental.AssetImporters.AssetImporterEditor.GetSerializedObjectInternal () (at C:/buildslave/unity/build/Editor/Mono/ImportSettings/AssetImporterEditor.cs:73)
UnityEditor.Editor.get_serializedObject () (at C:/buildslave/unity/build/Editor/Mono/Inspector/Editor.cs:433)
UnityEditor.BaseAssetImporterTabUI.get_serializedObject () (at C:/buildslave/unity/build/Editor/Mono/ImportSettings/BaseAssetImporterTabUI.cs:13)
UnityEditor.ModelImporterModelEditor.OnEnable () (at C:/buildslave/unity/build/Editor/Mono/ImportSettings/ModelImporterModelEditor.cs:48)
UnityEditor.AssetImporterTabbedEditor.OnEnable () (at C:/buildslave/unity/build/Editor/Mono/Inspector/TabbedEditor.cs:83)
UnityEditor.ModelImporterEditor.OnEnable () (at C:/buildslave/unity/build/Editor/Mono/ImportSettings/ModelImporterEditor.cs:17)


I have never touched any of those files.

I keep seeing this and have to try to build several times before it works.

 

Have you found the solution to this? Having the same problem. Can't find a solution ANYWHERE