File contains the same file identifier (3) for multiple object types (PrefabImporter) (MeshCollider)

Unity Engine
1 
File contains the same file identifier (3) for multiple object types (PrefabImporter) (MeshCollider). Object may be overwritten.
UnityEngine.StackTraceUtility:ExtractStackTrace ()
HutongGames.PlayMakerEditor.ProjectTools:smile:oPreprocessPrefabFSMsInBuild () (at Assets/PlayMaker/Editor/PlayMakerProjectTools.cs:115)
HutongGames.PlayMakerEditor.ProjectTools:PreprocessPrefabFSMs () (at Assets/PlayMaker/Editor/PlayMakerProjectTools.cs:57)
HutongGames.PlayMakerEditor.PlayMakerBuildCallbacks/PlayMakerPreProcessBuild:OnPreprocessBuild (UnityEditor.Build.Reporting.BuildReport) (at Assets/PlayMaker/Editor/PlayMakerBuildCallbacks.cs:31)
UnityEngine.GUIUtility:ProcessEvent (int,intptr)

It appears when I open the Project but as well when exporting to mobile.
Unity 2019.4.25

How can I resolve this error?

2

You should be able to click the message to see which asset has this issue.
Usually this comes from a bad merge, so hopefully you can revert to a working version of the asset from version control.

3

I have this error for a long time now, so no way to go back. I didn’t do anything about it because it didn’t affect the build apparently.

When I click the message nothing happens.

4

Is there another way to find out which asset has the problem? Without having to replace all of the assets in my game? Would appreciate any help.