Unity Android Build in Mac: TypeLoadException: Could not load type 'UnityEditor.iOS.Xcode.PlistDocument'

[Richard Fu]

I have similar errors similar to this topic, few errors popup every time I put Unity into foreground or changing any file. (It is NOT happened when build.) It seems that Unity want to verify file and Firebase.Editor.XcodeProjectPatcher.ReadConfig get called, then it tries to run some code about iOS, but I actually on Android build settings so no UnityEditor.iOS.Xcode.PlistDocument class is found!

Errors:

TypeLoadException: Could not load type 'UnityEditor.iOS.Xcode.PlistDocument' from assembly 'Unity.iOS.Extensions.Xcode, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null'.
Firebase.Editor.XcodeProjectPatcher.ReadConfig (Boolean errorOnNoConfig, System.String filename)
Rethrow as TypeInitializationException: An exception was thrown by the type initializer for Firebase.Editor.XcodeProjectPatcher
System.Reflection.MonoCMethod.Invoke (System.Object obj, BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System.Reflection/MonoMethod.cs:513)
Rethrow as TargetInvocationException: Exception has been thrown by the target of an invocation.
System.Reflection.MonoCMethod.Invoke (System.Object obj, BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System.Reflection/MonoMethod.cs:519)
System.Reflection.MonoCMethod.Invoke (BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System.Reflection/MonoMethod.cs:528)
System.Reflection.ConstructorInfo.Invoke (System.Object[] parameters) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System.Reflection/ConstructorInfo.cs:77)
System.Activator.CreateInstance (System.Type type, Boolean nonPublic) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System/Activator.cs:372)
System.Activator.CreateInstance (System.Type type) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System/Activator.cs:254)
UnityEditor.AssetPostprocessingInternal.GetMeshProcessorVersions () (at /Users/builduser/buildslave/unity/build/Editor/Mono/AssetPostprocessor.cs:158)
UnityEditor.AssetPostprocessingInternal:GetMeshProcessorVersions()

I am in:
Unity 5.5.3p2 Android build
macOS 10.12.5

iOS Resolver setting is attached and it said Cocoapods installation detected.

[Richard Fu]

The errors are gone in fresh project so spent half day debugging this by removing files one by one.

Finally found the problem is Firebase is clashing a localization Unity plugin I2 Localization, which having a modified UnityEngine.iOS.Xcode package for added localization functions

It's PlistDocument:

namespace UnityEditor.iOS_I2Loc.Xcode
{
    public class PlistDocument
    {
        public PlistDocument();

I think this causes the problem, Firebase is trying to use PlistDocument, regardless the namespace, and getting I2's PlistDocument which not matching the UnityEditor.iOS.Xcode namespace?

I will let I2's creator know but it will be great if Firebase can fix this.

[Richard Fu]

I can confirm that iOS has the same errors too!

TypeLoadException: Could not load type 'UnityEditor.iOS.Xcode.PlistDocument' from assembly 'Unity.iOS.Extensions.Xcode, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null'.
Firebase.Editor.XcodeProjectPatcher.ReadConfig (Boolean errorOnNoConfig, System.String filename)
Rethrow as TypeInitializationException: An exception was thrown by the type initializer for Firebase.Editor.XcodeProjectPatcher

System.Runtime.CompilerServices.RuntimeHelpers.RunClassConstructor (RuntimeTypeHandle type) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System.Runtime.CompilerServices/RuntimeHelpers.cs:101)
UnityEditor.EditorAssemblies.ProcessEditorInitializeOnLoad (System.Type type) (at /Users/builduser/buildslave/unity/build/Editor/Mono/EditorAssemblies.cs:136)

Rethrow as TargetInvocationException: Exception has been thrown by the target of an invocation.

System.Reflection.MonoMethod.Invoke (System.Object obj, BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System.Reflection/MonoMethod.cs:232)
System.Reflection.MethodBase.Invoke (System.Object obj, System.Object[] parameters) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System.Reflection/MethodBase.cs:115)
UnityEditor.HostView.Invoke (System.String methodName, System.Object obj) (at /Users/builduser/buildslave/unity/build/Editor/Mono/HostView.cs:262)
UnityEditor.HostView.Invoke (System.String methodName) (at /Users/builduser/buildslave/unity/build/Editor/Mono/HostView.cs:255)
UnityEditor.HostView.OnFocus () (at /Users/builduser/buildslave/unity/build/Editor/Mono/HostView.cs:99)

[Stewart Miles]

Thanks for digging into this Richard.

We're using UnityEditor.iOS.Xcode.PlistDocument throughout our code.  Unity shipped the UnityEditor Xcode extensions DLL with conflicting assembly vs. namespace names so we have a workaround in place here https://github.com/googlesamples/unity-jar-resolver/blob/master/source/IOSResolver/src/IOSResolver.cs#L295 .  After the Xcode extension is loaded we can then call methods that resolve to the UnityEditor.iOS.Xcode extension.

Are you sure that disabling / removing I2 Localization solves the problem?

Cheers,

Stewart

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[Stewart Miles]

Hi Richard, any update on this?

Cheers,

Stewart

[Richard Fu]

Hi Stewart,

Thank for the reply, I asked plugin creator and he has updated his dll using another signature. The problem has been fixed.