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Fixed in 2018.3



Found in


Issue ID




[WSA] XMLSerializerException thrown when running the IL2CPP build

Steps to reproduce:
1. Open the attached project (
2. Open the Assets/Game.unity scene
3. Switch platform to Windows Store
4. Build for WSA Universal 10 SDK (IL2CPP backend), Build type - XAML
5. Open Visual Studio solution
6. Deploy on local machine (Debug or Release)
7. Observe the errors in the Output console

Expected result: Errors should not appear in the Output console
Actual result: Errors appear in the Output console

Not reproducible with Master mode

Reproduced with: 5.6.0b10, 5.6.0b11, 2017.1.0a2
Not reproduced with: 5.4.5f1, 5.5.2p2

Fixed in: 2018.3.0a11 (on .NET Standard 2.0 Api Compatibility Level)

Comments (15)

  1. 36c65e3934745df83910152c6a077e4a?d=mm


    Aug 18, 2020 11:30

    good one <a href="">lyricsauto</a>

  2. 6ca7782e240804d0e9125b211b22bf83?d=mm


    May 14, 2019 07:48

    Apparently this Bug still exists in Unity 2018.3.14 ... still the only thing working is switching to compatibility level ".Net Standard 2.0" ... exception is thrown for

    var serializer = new XmlSerializer(typeof(SomeType));


    System.ArgumentException: 'CP1252' is not supported encoding name.

  3. 03c5c8d4d35707deec820f38872683e7?d=mm


    May 14, 2019 07:45

    This issue appears to persist in Unity 2018.3.14

  4. Bd236ddb418d5b65aaa18efa0eaf1215?d=mm


    Mar 25, 2019 15:37

    Still had this issue in 2018.3.4f1 with Api Compatibility Level .Net 4.x
    Switching to .Net Standard 2.0 (still throws an exception but) worked for me.

  5. 4d636c2c1f464ea51a9faf9c417154f3?d=mm


    Oct 29, 2018 15:40

    Seems to be still open for 2018.3.0b6 with .NET 4.6 enabled. I think this should not only be fixed for a specific framework, but for all available frameworks. Could you please reopen this issue so that we can cast votes again?

  6. 6cf884289b30bf5f6adaf9a54ff0361e?d=mm


    Sep 13, 2018 20:53

    I see that 2018.3b was released for beta. However, this issue is not mentioned in the release notes. Is this fixed?

  7. De2a1e57672f86438dbae1a0c307ad45?d=mm


    Aug 06, 2018 15:02

    So which version of Unity is this fixed for IL2CPP?

  8. 6cf884289b30bf5f6adaf9a54ff0361e?d=mm


    Jul 26, 2018 23:52

    Just upgraded to 2018.2.1f1. I confirmed that the System.XML.Serialization issue is fixed under 2018.2.1f1 under the ".NET Standard 2.0" selection in the "API Compatibility Level" setting.

  9. 6cf884289b30bf5f6adaf9a54ff0361e?d=mm


    Jul 26, 2018 22:20

    @joshpeterson - I am currently using 2018.1. Is there a release date for the 2018.3 beta? I am also using System.Xml.Serialization and have the same output as @cruelbob. I am unable to run on iOS and release to my testers because of this error.

  10. B1dfd1c8a2662016a5818a9f27432c47?d=mm


    Jul 04, 2018 13:06

    Caught this error on Unity 2018.1.6f1 using .Net Standard 2.0:
    NotSupportedException: /Users/builduser/buildslave/unity/build/External/il2cpp/il2cpp/libil2cpp/icalls/mscorlib/System.Reflection.Emit/AssemblyBuilder.cpp(20) : Unsupported internal call for IL2CPP:AssemblyBuilder::basic_init - System.Reflection.Emit is not supported.
    System.Reflection.Emit.AssemblyBuilder..ctor (System.Reflection.AssemblyName n, System.String directory, System.Reflection.Emit.AssemblyBuilderAccess access, System.Boolean corlib_internal) (at <00000000000000000000000000000000>:0)
    System.AppDomain.DefineDynamicAssembly (System.Reflection.AssemblyName name, System.Reflection.Emit.AssemblyBuilderAccess access, System.String dir, System.Security.Policy.Evidence evidence, System.Security.PermissionSet requiredPermissions, System.Security.PermissionSet optionalPermissions, System.Security.PermissionSet refusedPermissions, System.Boolean isSynchronized) (at <00000000000000000000000000000000>:0)
    System.AppDomain.DefineDynamicAssembly (System.Reflection.AssemblyName name, System.Reflection.Emit.AssemblyBuilderAccess access) (at <00000000000000000000000000000000>:0)
    System.Xml.Serialization.TempAssembly.GenerateRefEmitAssembly (System.Xml.Serialization.XmlMapping[] xmlMappings, System.Type[] types, System.String defaultNamespace, System.Security.Policy.Evidence evidence) (at <00000000000000000000000000000000>:0)
    System.Xml.Serialization.TempAssembly..ctor (System.Xml.Serialization.XmlMapping[] xmlMappings, System.Type[] types, System.String defaultNamespace, System.String location, System.Security.Policy.Evidence evidence) (at <00000000000000000000000000000000>:0)
    System.Xml.Serialization.XmlSerializer.GenerateTempAssembly (System.Xml.Serialization.XmlMapping xmlMapping, System.Type type, System.String defaultNamespace) (at <00000000000000000000000000000000>:0)
    System.Xml.Serialization.XmlSerializer..ctor (System.Type type, System.String defaultNamespace) (at <00000000000000000000000000000000>:0)

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