Il2cpp error. Please how do i fix this. Started after i upgrade to unity 2019.4.8f1.

Failed running C:\Program Files\Unity\Editor\Data\il2cpp/build/deploy/net471/il2cpp.exe --convert-to-cpp --emit-null-checks --enable-array-bounds-check --dotnetprofile="unityaot" --compile-cpp --libil2cpp-static --platform="Android" --architecture="ARMv7" --configuration="Release" --outputpath="C:\Users\user\Documents\ballisticadmob\Temp\StagingArea\assets\bin\Data\Native\armeabi-v7a\libil2cpp.so" --cachedirectory="C:\Users\user\Documents\ballisticadmob\Assets\..\Library\il2cpp_android_armeabi-v7a/il2cpp_cache" --additional-include-directories="C:/Program Files/Unity/Editor/Data/PlaybackEngines/AndroidPlayer/Tools\bdwgc/include" --additional-include-directories="C:/Program Files/Unity/Editor/Data/PlaybackEngines/AndroidPlayer/Tools\libil2cpp/include" --tool-chain-path="D:/androidndkLocation/android-ndk-r19" --profiler-report --map-file-parser="C:/Program Files/Unity/Editor/Data/Tools/MapFileParser/MapFileParser.exe" --directory=C:/Users/user/Documents/ballisticadmob/Temp/StagingArea/assets/bin/Data/Managed --generatedcppdir=C:/Users/user/Documents/ballisticadmob/Temp/StagingArea/Il2Cpp/il2cppOutput

stdout:
Building libil2cpp.so with AndroidToolChain
Output directory: C:\Users\user\Documents\ballisticadmob\Temp\StagingArea\assets\bin\Data\Native\armeabi-v7a
Cache directory: C:\Users\user\Documents\ballisticadmob\Library\il2cpp_android_armeabi-v7a\il2cpp_cache
ObjectFiles: 178 of which compiled: 91
Time Compile: 40716 milliseconds Il2CppAttributes.cpp
Time Compile: 26721 milliseconds mscorlib11.cpp
Time Compile: 26631 milliseconds mscorlib19.cpp
Time Compile: 26485 milliseconds Il2CppInvokerTable.cpp
Time Compile: 24782 milliseconds System.cpp
Time Compile: 24394 milliseconds mscorlib6.cpp
Time Compile: 23798 milliseconds mscorlib8.cpp
Time Compile: 23516 milliseconds Generics6.cpp
Time Compile: 23481 milliseconds Generics.cpp
Time Compile: 23133 milliseconds Generics1.cpp
Total compilation time: 239241 milliseconds.
il2cpp.exe didn't catch exception: System.IO.FileNotFoundException: Could not find file 'C:\Users\user\Documents\ballisticadmob\Library\il2cpp_android_armeabi-v7a\il2cpp_cache\linkresult_1B9C66F3BBA12FD6124C897E4E45F891\libil2cpp.so'.
File name: 'C:\Users\user\Documents\ballisticadmob\Library\il2cpp_android_armeabi-v7a\il2cpp_cache\linkresult_1B9C66F3BBA12FD6124C897E4E45F891\libil2cpp.so'
at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
at System.IO.File.InternalMove(String sourceFileName, String destFileName, Boolean checkHost)
at Unity.IL2CPP.Building.ToolChains.AndroidToolChain.OnAfterLink(NPath outputFile, CppToolChainContext toolChainContext, Boolean forceRebuild, Boolean verbose)
at Unity.IL2CPP.Building.CppProgramBuilder.PostprocessObjectFiles(HashSet`1 objectFiles, CppToolChainContext toolChainContext)
at Unity.IL2CPP.Building.CppProgramBuilder.Build(IBuildStatistics& statistics)
at il2cpp.Program.DoRun(String[] args, List`1 foundAssemblies)
at il2cpp.Program.Run(String[] args, Boolean setInvariantCulture)
at il2cpp.Program.Main(String[] args)
stderr:

Unhandled Exception: System.IO.FileNotFoundException: Could not find file 'C:\Users\user\Documents\ballisticadmob\Library\il2cpp_android_armeabi-v7a\il2cpp_cache\linkresult_1B9C66F3BBA12FD6124C897E4E45F891\libil2cpp.so'.
at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
at System.IO.File.InternalMove(String sourceFileName, String destFileName, Boolean checkHost)
at Unity.IL2CPP.Building.ToolChains.AndroidToolChain.OnAfterLink(NPath outputFile, CppToolChainContext toolChainContext, Boolean forceRebuild, Boolean verbose)
at Unity.IL2CPP.Building.CppProgramBuilder.PostprocessObjectFiles(HashSet`1 objectFiles, CppToolChainContext toolChainContext)
at Unity.IL2CPP.Building.CppProgramBuilder.Build(IBuildStatistics& statistics)
at il2cpp.Program.DoRun(String[] args, List`1 foundAssemblies)
at il2cpp.Program.Run(String[] args, Boolean setInvariantCulture)
at il2cpp.Program.Main(String[] args)

UnityEngine.Debug:LogError(Object)
UnityEditorInternal.Runner:RunProgram(Program, String, String, String, CompilerOutputParserBase)
UnityEditorInternal.Runner:RunManagedProgram(String, String, String, CompilerOutputParserBase, Action`1)
UnityEditorInternal.IL2CPPBuilder:RunIl2CppWithArguments(List`1, Action`1, String)
UnityEditorInternal.IL2CPPBuilder:ConvertPlayerDlltoCpp(Il2CppBuildPipelineData, String, String, Boolean)
UnityEditorInternal.IL2CPPBuilder:Run()
UnityEditorInternal.IL2CPPUtils:RunIl2Cpp(String, String, IIl2CppPlatformProvider, Action`1, RuntimeClassRegistry)
UnityEngine.GUIUtilityrocessEvent(Int32, IntPtr)

 

managed to get it fixed?