precompiledAssemblyException nunit.framework.dll error unity 2018.4.36f1 and 2019

[Lightology]

PrecompiledAssemblyException: Multiple precompiled assemblies with the same name nunit.framework.dll included or the current platform. Only one assembly with the same name is allowed per platform. Assembly paths:

D:/Programs/Unity/Unity/2018.4.36f1/Editor/Data/UnityExtensions/Unity/TestRunner/net35/unity-custom/nunit.framework.dll
D:/PATH/PROJ/Library/PackageCache/com.unity.ext.nunit@1.0.6/net35/unity-custom/nunit.framework.dll

UnityEditor.Scripting.ScriptCompilation.EditorBuildRules.ValidateAndGetNameToPrecompiledAssembly (UnityEditor.Scripting.ScriptCompilation.PrecompiledAssembly[ ] precompiledAssemblies) (at C:/buildslave/unity/build/Editor/Mono/Scripting/ScriptCompilation/EditorBuildRules.cs:569)
UnityEditor.Scripting.ScriptCompilation.EditorBuildRules.ToScriptAssemblies (System.Collections.Generic.IDictionary2[TKey,TValue] targetAssemblies, UnityEditor.Scripting.ScriptCompilation.ScriptAssemblySettings settings, UnityEditor.Scripting.ScriptCompilation.EditorBuildRules+CompilationAssemblies assemblies, System.Collections.Generic.HashSet1[T] runUpdaterAssemblies) (at C:/buildslave/unity/build/Editor/Mono/Scripting/ScriptCompilation/EditorBuildRules.cs:581)
UnityEditor.Scripting.ScriptCompilation.EditorBuildRules.GetAllScriptAssemblies (System.Collections.Generic.IEnumerable1[T] allSourceFiles, System.String projectDirectory, UnityEditor.Scripting.ScriptCompilation.ScriptAssemblySettings settings, UnityEditor.Scripting.ScriptCompilation.EditorBuildRules+CompilationAssemblies assemblies, UnityEditor.Scripting.ScriptCompilation.EditorBuildRules+TargetAssemblyType onlyIncludeType) (at C:/buildslave/unity/build/Editor/Mono/Scripting/ScriptCompilation/EditorBuildRules.cs:328) UnityEditor.Scripting.ScriptCompilation.EditorCompilation.GetAllScriptAssemblies (UnityEditor.Scripting.ScriptCompilation.EditorScriptCompilationOptions options, UnityEditor.Scripting.ScriptCompilation.ScriptAssemblySettings settings, UnityEditor.Scripting.ScriptCompilation.PrecompiledAssembly[ ] unityAssembliesArg, UnityEditor.Scripting.ScriptCompilation.PrecompiledAssembly[ ] precompiledAssembliesArg) (at C:/buildslave/unity/build/Editor/Mono/Scripting/ScriptCompilation/EditorCompilation.cs:1538) UnityEditor.Scripting.ScriptCompilation.EditorCompilation.GetAllScriptAssemblies (UnityEditor.Scripting.ScriptCompilation.EditorScriptCompilationOptions options, UnityEditor.Scripting.ScriptCompilation.ScriptAssemblySettings settings) (at C:/buildslave/unity/build/Editor/Mono/Scripting/ScriptCompilation/EditorCompilation.cs:1516) UnityEditor.Scripting.ScriptCompilation.EditorCompilation.DeleteUnusedAssemblies (UnityEditor.Scripting.ScriptCompilation.ScriptAssemblySettings settings) (at C:/buildslave/unity/build/Editor/Mono/Scripting/ScriptCompilation/EditorCompilation.cs:796) UnityEditor.Scripting.ScriptCompilation.EditorCompilation.CompileScripts (UnityEditor.Scripting.ScriptCompilation.ScriptAssemblySettings scriptAssemblySettings, System.String tempBuildDirectory, UnityEditor.Scripting.ScriptCompilation.EditorScriptCompilationOptions options, UnityEditor.Scripting.ScriptCompilation.EditorBuildRules+TargetAssembly[ ]& notCompiledTargetAssemblies, System.String[ ]& notCompiledScripts) (at C:/buildslave/unity/build/Editor/Mono/Scripting/ScriptCompilation/EditorCompilation.cs:993) UnityEditor.Scripting.ScriptCompilation.EditorCompilation.CompileScripts (UnityEditor.Scripting.ScriptCompilation.EditorScriptCompilationOptions options, UnityEditor.BuildTargetGroup platformGroup, UnityEditor.BuildTarget platform) (at C:/buildslave/unity/build/Editor/Mono/Scripting/ScriptCompilation/EditorCompilation.cs:952) UnityEditor.Scripting.ScriptCompilation.EditorCompilationInterface+<CompileScripts>c__AnonStorey3.<>m__0 () (at C:/buildslave/unity/build/Editor/Mono/Scripting/ScriptCompilation/EditorCompilationInterface.cs:283) UnityEditor.Scripting.ScriptCompilation.EditorCompilationInterface.EmitExceptionAsError[T] (System.Func1[TResult] func, T returnValue) (at C:/buildslave/unity/build/Editor/Mono/Scripting/ScriptCompilation/EditorCompilationInterface.cs:104)
UnityEditor.Scripting.ScriptCompilation.EditorCompilationInterface:CompileScripts(EditorScriptCompilationOptions, BuildTargetGroup, BuildTarget) (at C:/buildslave/unity/build/Editor/Mono/Scripting/ScriptCompilation/EditorCompilationInterface.cs:283)

[Lightology]

Fixed by updating to 2019.1.0f1

[Kurt-Dekker]

Also, if you don’t need that crud, take it out.

Extra unwanted packages in new projects (collab, testing, rider and other junk):

Temp/UnityEngine.TestRunner.dll Error

Recent versions of unity have an annoying habit of crapping useless packages into your project. When those packages inevitably have errors, this sort of thing happens. I have railed about it before. Go into the package manager and remove crap you don’t need, like the entire test runner and collab and whatnot. If you feel brave you can hand-edit the Packages/manifest.json file a lot faster than using the laggy package manager interface that only lets you remove one package at a time: [7287748-…

About the fastest way I have found to make a project and avoid all this noise is to create the project, then as soon as you see the files appear, FORCE-STOP (hard-kill) Unity (with the Activity Manager or Task Manager), then go hand-edit the Packages/manifest.json file as outlined in the above post, then reopen Unity.

Sometimes the package system gets borked from all this unnecessary churn and requires the package cache to be cleared:

Unity3D Package Cache errors(?)