Duplicate Native Method: iOSInit

Hey guys,

For some weird reason when I build for iOS, I keep getting this error thats stopping me from exporting.

SystemException: Duplicate native method found : IOSInit. Please check your source carefully.
UnityEditor.MonoAOTRegistration.ExtractNativeMethodsFromTypes (ICollection`1 types, System.Collections.ArrayList res) (at /Users/builduser/buildslave/unity/build/Editor/Mono/BuildPipeline/MonoInternalCallGenerator.cs:27)
UnityEditor.MonoAOTRegistration.BuildNativeMethodList (Mono.Cecil.AssemblyDefinition[] assemblies) (at /Users/builduser/buildslave/unity/build/Editor/Mono/BuildPipeline/MonoInternalCallGenerator.cs:49)
UnityEditor.MonoAOTRegistration.WriteCPlusPlusFileForStaticAOTModuleRegistration (BuildTarget buildTarget, System.String file, CrossCompileOptions crossCompileOptions, Boolean advancedLic, System.String targetDevice, Boolean stripping, UnityEditor.RuntimeClassRegistry usedClassRegistry, UnityEditor.AssemblyReferenceChecker checker) (at /Users/builduser/buildslave/unity/build/Editor/Mono/BuildPipeline/MonoInternalCallGenerator.cs:87)
UnityEditor.iOS.PostProcessiPhonePlayer.PostProcess (BuildTarget target, System.String stagingAreaData, System.String stagingArea, System.String stagingAreaDataManaged, System.String playerPackage, System.String installPath, System.String companyName, System.String productName, BuildOptions options, UnityEditor.RuntimeClassRegistry usedClassRegistry) (at /Users/builduser/buildslave/unity/build/PlatformDependent/iPhonePlayer/Extensions/Common/BuildPostProcessor.cs:443)
UnityEditor.iOS.iOSBuildPostprocessor.PostProcess (BuildPostProcessArgs args) (at /Users/builduser/buildslave/unity/build/PlatformDependent/iPhonePlayer/Extensions/Common/ExtensionModule.cs:27)
UnityEditor.PostprocessBuildPlayer.Postprocess (BuildTarget target, System.String installPath, System.String companyName, System.String productName, Int32 width, Int32 height, System.String downloadWebplayerUrl, System.String manualDownloadWebplayerUrl, BuildOptions options, UnityEditor.RuntimeClassRegistry usedClassRegistry, UnityEditor.BuildReporting.BuildReport report) (at /Users/builduser/buildslave/unity/build/Editor/Mono/BuildPipeline/PostprocessBuildPlayer.cs:176)
UnityEditor.HostView:OnGUI()

I can’t figured out what the issue is. I noticed that in two of my classes I had the same methods but with different signatures, but I fixed this and now have only one method with the same name in each class instead of two. I thought that would fix the issue but no luck.

Anyone know how to fix this issue?

Thanks

hi, i just downgrade from fb sdk 7.8 to 7.7 and the problem solved , hope it helps

I just changed scripting backend from player setting to IL2CPP from Mono2x .
Its work for me.