ReflectionTypeLoadException

Question

I have a project which has been working fine until now. When importing packages -- such as assets purchased from the asset store -- Unity displays an internal compiler error (Unhandled Exception: System.Reflection.ReflectionTypeLoadException: The classes in the module cannot be loaded). The same occurs when simply copying said project files into the Assets folder, but not when creating a new project and importing packages. Thankfully I had a backup copy of my project (which I then copied again for safety); it also works fine on its own, but breaks immediately when certain packages are imported. Apart from AssetStore packages, it even breaks when importing some Unity packages:

Water (Basic): OK

Water (Pro): Internal compiler error

Attempting to narrow the cause further, I have found that the error only occurs (at least with Water(Pro)) when c# scripts are placed in the Assets/Editor folder. Deleting all scripts from there prevented the error, while creating a new c# script in the folder caused the error. Deleting every line of code in said c# script did not change the situation; I had to delete the .cs file itself to remove the error. Further, it seems that if any c# scripts are placed in any /Editor folder, located anywhere in the project (such as Assets/SomeImportedAsset/SomeFolders/Editor), will result in the same error. Javascript files placed in Assets/Editor (or elsewhere) do not cause the error.

Any assistance would be appreciated. I apologize for not providing more information, but that is all I have; the error message is very unclear, and the entire situation is very strange.

Answer 1

Best Answer

Answer by AlwaysSomething · Feb 12, 2014 at 02:24 AM

Answering my own question after many hours of testing.

Check .dll's in the Assets folder. In this case, System.Web was causing the error. None of the System.Web.dll files located on my computer -- regardless of version -- worked without generating this particular error; I downloaded a copy of System.Web.dll v2.0.50727 x86 off the internet.

As for why the error only occurred when c# scripts were placed in an /Editor folder, Assembly-CSharp-Editor is only created under that condition, and it appears that only that assembly generates the error. Removing the reference to System.Web.dll in the assembly changed nothing. It is unclear as to why this is the case. Perhaps a Unity dev would have more insight.

I must strongly recommend improved error messages/logs for this; if System.Web.dll had been clearly referenced, rather than UnityEditor.Android.Extensions.dll, the error could've been resolved within minutes rather than hours. I suspect the same would be true for many other users.

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jarl-ostensen · Mar 13, 2014 at 03:04 PM 0

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Glad you found a fix, I'm dealing with a similar one with even less helpful information;

Internal compiler error. See the console log for more information. output was: Unhandled Exception: System.Reflection.ReflectionTypeLoadException: The classes in the module cannot be loaded.

at (wrapper managed-to-native) System.Reflection.Assembly:GetTypes (bool)

at System.Reflection.Assembly.GetTypes () [0x00000] in :0

at $$anonymous$$ono.CSharp.RootNamespace.ComputeNamespaces (System.Reflection.Assembly assembly, System.Type extensionType) [0x00000] in :0

at $$anonymous$$ono.CSharp.RootNamespace.ComputeNamespace ($$anonymous$$ono.CSharp.CompilerContext ctx, System.Type extensionType) [0x00000] in :0

at $$anonymous$$ono.CSharp.GlobalRootNamespace.ComputeNamespaces ($$anonymous$$ono.CSharp.CompilerContext ctx) [0x00000] in :0

at $$anonymous$$ono.CSharp.Driver.LoadReferences () [0x00000] in :0

at $$anonymous$$ono.CSharp.Driver.Compile () [0x00000] in :0

at $$anonymous$$ono.CSharp.Driver.$$anonymous$$ain (System.String[] args) [0x00000] in :0

I'll update this thread if I find out what it is...

Answer 2

Answer by Stn · Jul 24, 2014 at 03:31 AM

i had same problem too and i exectude Assets>Reimoprt All(maybe you need to backup your project before do this) then it fix i do not know the reason but it work for me

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aleksey_173 · Jul 27, 2014 at 06:36 PM 0

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Assets>Reimoprt All worked for me!!! thanks!!!

andrew-lukasik · Aug 17, 2014 at 07:00 PM 0

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THAN$$anonymous$$ YOU :D I couldn't believe it but that actually worked!

ps: in my case i needed to repeat reimport few times.

adityasankar · Oct 08, 2014 at 12:26 AM 0

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This worked for me as well. Not enough rep to upvote, but kudos!

$$anonymous$$ · Jun 07, 2015 at 12:40 PM 0

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This did not work for me, but it did give me an extra error (which is good). Progress! Thanks!

Answer 3

Answer by twburger · Mar 11, 2015 at 05:41 AM

I found the problem for my project when I got this error message was that I was using a DLL built using a .Net 4.5.1 framework. After replacing the offending DLL and then Assets > Reimport All it was fine. The problem is that Mono (the generic multiplatform .Net clone) will only work with .Net up to 3.5.

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Wolfram · May 20, 2015 at 01:36 PM 0

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This solved it for me, thanks!

Answer 4

Answer by jrhtcg · Feb 18, 2015 at 06:21 AM

I was having a similar problem with the same error message. Thanks to the answer above that noted the problem was with the editor folder I found a solution to my problem.

I stripped out all the editor scripts from my original DLL project and created a separate project for them. I then recompiled both projects and put the resulting DLLs into my game's Asset folder like so:

/Assets/MyDLL/MyDLL.dll /Assets/MyDLL/Editor/MyDLLEditor.dll

This was indeed a strange problem to track down, as I could run my game just fine from the editor. The error only showed up when I tried to build the game as a standalone player. Hopefully this will help someone else as it appears the error message given applies to more than one kind of problem.

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Answer 5

Answer by valentemesmo · Jun 02, 2015 at 02:36 PM

In my case, I had AndroidJavaObject on a DLL used in All Platforms... I moved all AndroidJavaObject to a Android only DLL... problem solved!

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