Hello, it's my action in asp.net mvc: string scss = @"@import """ + Server.MapPath(scssPath) + @""";"; var compiler = new SassCompiler(); //string compiled = compiler.Compile(source: scss); //returns "button.button {background-color:#ffffff;}button.button:hover {opacity:0.5;}" var compiled = compiler.Compile(scss); I have the error An exception of type 'System.Runtime.InteropServices.COMException' occurred in mscorlib.dll but was not handled in user code Additional information: The handle is invalid. (Exception from HRESULT: 0x80070006 (E_HANDLE)) What can be reason for it?