My project from Unity4.5.2 upgrade to Unity4.6.3, set ScriptingBackend to IL2CPP, Build project fail

My project from Unity4.5.2 upgrade to Unity4.6.3, set ScriptingBackend to IL2CPP, Build project fails, an error is as follows:

Failed running /Applications/Unity4.6.3/Unity.app/Contents/Frameworks/il2cpp/il2cpp.exe --copy-level=None --enable-generic-sharing --enable-unity-event-support --emit-null-checks --enable-array-bounds-check "/Users/ugc-imac/Projects/BattleTower/Version 2.81RC DEV_U4.6/Temp/StagingArea/Data/Managed/Assembly-CSharp-firstpass.dll" "/Users/ugc-imac/Projects/BattleTower/Version 2.81RC DEV_U4.6/Temp/StagingArea/Data/Managed/Assembly-CSharp.dll" "/Users/ugc-imac/Projects/BattleTower/Version 2.81RC DEV_U4.6/Temp/StagingArea/Data/Managed/Assembly-UnityScript-firstpass.dll" "/Users/ugc-imac/Projects/BattleTower/Version 2.81RC DEV_U4.6/Temp/StagingArea/Data/Managed/Assembly-UnityScript.dll" "/Users/ugc-imac/Projects/BattleTower/Version 2.81RC DEV_U4.6/Temp/StagingArea/Data/Managed/UnityEngine.UI.dll" "/Users/ugc-imac/Projects/BattleTower/Version 2.81RC DEV_U4.6/Temp/il2cppOutput/il2cppOutput"

stdout;
IL2CPP error for method 'System.Void BattleInput::RegisterEnchantmentUsed(EEnchantment)' in assembly '/Users/ugc-imac/Projects/BattleTower/Version 2.81RC DEV_U4.6/Temp/StagingArea/Data/Managed/Assembly-CSharp.dll'
Additional information: Build a development build for more information. Operation is not valid due to the current state of the object
stderr:

Unhandled Exception: System.InvalidOperationException: Operation is not valid due to the current state of the object
at System.Linq.Enumerable.Single[TypeReference] (IEnumerable`1 source, System.Func`2 predicate, Fallback fallback) [0x00000] in <filename unknown>:0
at System.Linq.Enumerable.Single[TypeReference] (IEnumerable`1 source, System.Func`2 predicate) [0x00000] in <filename unknown>:0
at Unity.IL2CPP.StackAnalysis.StackAnalysis.ComputeType (Unity.IL2CPP.StackAnalysis.Entry entry) [0x00000] in <filename unknown>:0
at Unity.IL2CPP.StackAnalysis.StackAnalysis+<ComputeGlobalVariables>c__AnonStorey39.<>m__E2 (Unity.IL2CPP.StackAnalysis.Entry item) [0x00000] in <filename unknown>:0
at System.Linq.Enumerable+<CreateSelectIterator>c__Iterator27`2[Unity.IL2CPP.StackAnalysis.Entry,Unity.IL2CPP.StackAnalysis.GlobalVariable].MoveNext () [0x00000] in <filename unknown>:0
at System.Collections.Generic.List`1[Unity.IL2CPP.StackAnalysis.GlobalVariable].AddEnumerable (IEnumerable`1 enumerable) [0x00000] in <filename unknown>:0
at System.Collections.Generic.List`1[Unity.IL2CPP.StackAnalysis.GlobalVariable].AddRange (IEnumerable`1 collection) [0x00000] in <filename unknown>:0
at Unity.IL2CPP.StackAnalysis.StackAnalysis.ComputeGlobalVariables () [0x00000] in <filename unknown>:0
at Unity.IL2CPP.StackAnalysis.StackAnalysis.get_Globals () [0x00000] in <filename unknown>:0
at Unity.IL2CPP.MethodBodyWriter.Generate () [0x00000] in <filename unknown>:0
at Unity.IL2CPP.MethodWriter.WriteMethodBody (Mono.Cecil.MethodReference method) [0x00000] in <filename unknown>:0
at Unity.IL2CPP.MethodWriter.WriteMethod (Mono.Cecil.MethodReference method, MethodWriteMode mode) [0x00000] in <filename unknown>:0
at Unity.IL2CPP.MethodWriter.WriteMethodAndWrappers (Mono.Cecil.MethodReference method, MethodWriteMode mode) [0x00000] in <filename unknown>:0
at Unity.IL2CPP.MethodWriter.WriteMethodDefinitions (System.Func`2 filter) [0x00000] in <filename unknown>:0
at Unity.IL2CPP.SourceWriter.WriteMethodDefinitionsFor (Unity.IL2CPP.CppCodeWriter writer, System.Func`2 filter, Mono.Cecil.TypeReference type, Unity.IL2CPP.Metadata.VTableBuilder vTableBuilder, Mono.Cecil.AssemblyDefinition mscorlib, Unity.IL2CPP.StringLiterals.StringLiteralCollection stringLiteralCollection) [0x00000] in <filename unknown>:0
at Unity.IL2CPP.SourceWriter.WriteSource (Unity.IL2CPP.CppCodeWriter writer, Unity.IL2CPP.GenericsCollection.InflatedCollection allGenerics, Mono.Cecil.TypeReference type, System.Collections.Generic.HashSet`1 emptyTypes, Unity.IL2CPP.StringLiterals.StringLiteralCollection stringLiteralCollection) [0x00000] in <filename unknown>:0
at Unity.IL2CPP.SourceWriter.WriteSourceFiles (System.String outputDirectory, System.String fileName, Unity.IL2CPP.GenericsCollection.InflatedCollection allGenerics, IEnumerable`1 typeList, System.Collections.Generic.HashSet`1 emptyTypes, Unity.IL2CPP.StringLiterals.StringLiteralCollection stringLiteralCollection) [0x00000] in <filename unknown>:0
at Unity.IL2CPP.SourceWriter.Write (Mono.Cecil.AssemblyDefinition assemblyDefinition, Unity.IL2CPP.GenericsCollection.InflatedCollection allGenerics, System.String outputDir, Mono.Cecil.TypeDefinition[] typeList, Unity.IL2CPP.StringLiterals.StringLiteralCollection stringLiteralCollection) [0x00000] in <filename unknown>:0
at Unity.IL2CPP.AssemblyConverter.Convert (Mono.Cecil.AssemblyDefinition assemblyDefinition, Unity.IL2CPP.StringLiterals.StringLiteralCollection stringLiteralCollection, Unity.IL2CPP.GenericsCollection.InflatedCollection allGenerics) [0x00000] in <filename unknown>:0
at Unity.IL2CPP.AssemblyConverter.Apply () [0x00000] in <filename unknown>:0
at Unity.IL2CPP.AssemblyConverter.ConvertAssemblies (System.String[] assemblies, System.String outputDir) [0x00000] in <filename unknown>:0

UnityEngine.Debug:LogError(Object)
UnityEditorInternal.Runner:RunManagedProgram(String, String, String, CompilerOutputParserBase)
UnityEditorInternal.IL2CPPBuilder:ConvertPlayerDlltoCpp(ICollection`1, String, String)
UnityEditorInternal.IL2CPPBuilder:Run()
UnityEditorInternal.IL2CPPUtils:RunIl2Cpp(String, String, IIl2CppPlatformProvider, Action`1, RuntimeClassRegistry)
UnityEditor.HostView:OnGUI()


I'm looking forward to the arrival of the reply。