Not able to build with VS2015

[JasonYanxx]

the code public bool IsError { get => !(CompileError == null && ExecuteError == null); } in source project make my building wrong!
Here is the error:
'Error CS0161 'ExecutionResult.IsError.get': not all code paths return a value Kernel'

[JasonYanxx]

usepublic bool IsError { get { return !(CompileError == null && ExecuteError == null); } } instead,then rebuild the project, eventually be fine!

[zabirauf]

I believe this might be happening because the msbuild installed by VS2015 doesn't support the newer version of C#. Can you try updating the VS 2015 or the msbuild version to latest and try again. Hopefully that should resolve the problem.

[JasonYanxx]

Indeed，I've updated msbuild to the latest version,i.e,6.10, but I still failed to build the project. The error mainly focus on the code below :public bool IsError { get => !(CompileError == null && ExecuteError == null); }. I rewrite this code with public bool IsError { get { return !(CompileError == null && ExecuteError == null); } } , and it works.