Error MSB4018: The "XamlCTask" task failed unexpectedly.

[balaameex]

Hi, I am getting Error MSB4018: The "XamlCTask" task failed unexpectedly. I downloaded the source code and run the IOS project in Simulator
The solution is not building in Visual studio in mac.

The "XamlCTask" task failed unexpectedly. error MSB4018: File name: '/Users/bala/Downloads/app-monkeychat-master 2/src/MonkeyChat/obj/Debug/MonkeyChat.dll.mdb'

Server stack trace: at System.IO.FileStream..ctor (System.String path, System.IO.FileMode mode, System.IO.FileAccess access, System.IO.FileShare share, System.Int32 bufferSize, System.Boolean anonymous, System.IO.FileOptions options) [0x00259] in /Users/builder/jenkins/workspace/build-package-osx-mono/2017-12/external/bockbuild/builds/mono-x64/mcs/class/corlib/System.IO/FileStream.cs:274 at System.IO.FileStream..ctor (System.String path, System.IO.FileMode mode, System.IO.FileAccess access, System.IO.FileShare share, System.Int32 bufferSize, System.Boolean isAsync, System.Boolean anonymous) [0x00000] in /Users/builder/jenkins/workspace/build-package-osx-mono/2017-12/external/bockbuild/builds/mono-x64/mcs/class/corlib/System.IO/FileStream.cs:149 at System.IO.FileStream..ctor (System.String path, System.IO.FileMode mode, System.IO.FileAccess access) [0x00000] in /Users/builder/jenkins/workspace/build-package-osx-mono/2017-12/external/bockbuild/builds/mono-x64/mcs/class/corlib/System.IO/FileStream.cs:86 at (wrapper remoting-invoke-with-check) System.IO.FileStream..ctor(string,System.IO.FileMode,System.IO.FileAccess) at Mono.CompilerServices.SymbolWriter.MonoSymbolFile.ReadSymbolFile (System.String mdbFilename) [0x00000] in :0 at Mono.CompilerServices.SymbolWriter.MonoSymbolFile.ReadSymbolFile (System.String mdbFilename, System.Guid assemblyGuid) [0x00000] in :0 at Mono.Cecil.Mdb.MdbReaderProvider.GetSymbolReader (Mono.Cecil.ModuleDefinition module, System.String fileName) [0x00012] in :0 at Mono.Cecil.ModuleReader.ReadSymbols (Mono.Cecil.ModuleDefinition module, Mono.Cecil.ReaderParameters parameters) [0x00032] in :0 at Mono.Cecil.ModuleReader.CreateModuleFrom (Mono.Cecil.PE.Image image, Mono.Cecil.ReaderParameters parameters) [0x00042] in :0 at Mono.Cecil.ModuleDefinition.ReadModule (System.IO.Stream stream, Mono.Cecil.ReaderParameters parameters) [0x00028] in :0 at Mono.Cecil.ModuleDefinition.ReadModule (System.String fileName, Mono.Cecil.ReaderParameters parameters) [0x0000a] in :0 at Mono.Cecil.AssemblyDefinition.ReadAssembly (System.String fileName, Mono.Cecil.ReaderParameters parameters) [0x00000] in :0 at Xamarin.Forms.Build.Tasks.XamlCTask.Compile () [0x001ca] in <930a2957a4504e3c88f57da7e79fce7c>:0 at Xamarin.Forms.Build.Tasks.XamlCTask.Execute () [0x00007] in <930a2957a4504e3c88f57da7e79fce7c>:0 at (wrapper xdomain-dispatch) Xamarin.Forms.Build.Tasks.XamlCTask.Execute(object,byte[]&,byte[]&)

Exception rethrown at [0]: at (wrapper xdomain-invoke) Xamarin.Forms.Build.Tasks.XamlCTask.Execute() at Microsoft.Build.BackEnd.TaskExecutionHost.Microsoft.Build.BackEnd.ITaskExecutionHost.Execute () [0x00023] in /Users/builder/jenkins/workspace/build-package-osx-mono/2017-12/external/bockbuild/builds/msbuild-15/src/Build/BackEnd/TaskExecutionHost/TaskExecutionHost.cs:631 at Microsoft.Build.BackEnd.TaskBuilder+<ExecuteInstantiatedTask>d__26.MoveNext () [0x00212] in /Users/builder/jenkins/workspace/build-package-osx-mono/2017-12/external/bockbuild/builds/msbuild-15/src/Build/BackEnd/Components/RequestBuilder/TaskBuilder.cs:787 (MSB4018) (MonkeyChat)