C# Error CS2019 – Invalid target type for /target: must specify ‘exe’, ‘winexe’, ‘library’, or ‘module’

C# Error

CS2019 – Invalid target type for /target: must specify ‘exe’, ‘winexe’, ‘library’, or ‘module’

Reason for the Error & Solution

Invalid target type for /target: must specify ‘exe’, ‘winexe’, ‘library’, or ‘module’

The compiler option was used, but an invalid parameter was passed. To resolve this error, recompile the program using the form of the /target option that is appropriate to your output file.

The following sample generates CS2017:

// CS2019.cs  
// compile with: /target:libra  
// CS2019 expected  
class MyClass  
{  
}