C# Error CS1680 – Invalid reference alias option: ‘{0}=’ — missing filename

C# Error

CS1680 – Invalid reference alias option: ‘{0}=’ — missing filename

Reason for the Error & Solution

Invalid reference alias option: ‘alias=’ — missing filename.

This error occurs when you use the alias feature with the /reference compiler option without specifying a valid file name.

The following sample generates CS1680.

// CS1680.cs  
// compile with: /reference:alias=  
// CS1680 expected  
// To resolve, specify the name of a file with an assembly manifest  
class MyClass {}