Unhandled Exception when saying quit

When typing quit i get the following error:

{
// This build system will build your cs file to exe file and will run it "cmd": ["del ${file/\.cs/\.exe/} 2>NUL", "& csc /nologo /out:${file/\.cs/\.exe/} $file", "& ${file/\.cs/\.exe/}"], "file_regex": "^(...?)[(]([0-9]*),([0-9])[)]", // By default csc is not in your PATH, so add it to your path // or uncomment "path" and check that it has correct value //"path": "C:/Windows/Microsoft.NET/Framework64/v4.0.30319/", "shell": true, // Without this sublime has hard times to parse "&" in out command line "selector": "source.cs" }