In the C# environment the following "internal" error occurs both locally and during submission:

Compilation succeeded - 1 warning(s)

{"stdout":"","stderr":"/tmp/csharp116422-21-1j5oftx/setup.cs(7,20): warning CS0414: The private field `Helper.random' is assigned but its value is never used\n","wallTime":0}
Unknown error
Process took 522ms to complete

I'm trying to solve this kata in C# and submitting the solution results in the following error:

Compilation succeeded - 1 warning(s)

{"stdout":"","stderr":"/tmp/csharp116422-23-1vclens/fixture.cs(13,24): warning CS0414: The private field `KataTest.KataSolution.random' is assigned but its value is never used\n","wallTime":0}
Unknown error
Process took 585ms to complete

The solution passes the local tests by the way.

The unknown error might be related to the warning.

I'm trying to solve the kata in C# and submitting the solution fails with the following error message:

Compilation succeeded - 1 warning(s)

{"stdout":"","stderr":"/tmp/csharp116420-25-1o1odfj/fixture.cs(8,20): warning CS0414: The private field `KataSolution.random' is assigned but its value is never used\n","wallTime":0}
Unknown error
Process took 769ms to complete

I suppose there is an internal error, because the local tests run without any problem.

The unknown error might be related to the warning, but this is just a wild guess.