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Compiler Error CS0641 

Error Message

'attribute' : attribute is only valid on classes derived from System.Attribute

An attribute was used that can only be used on a class that derives from System.Attribute.

The following sample generates CS0641:

// CS0641.cs
using System;

public class NonAttrClass   // CS0641
// try the following line instead
// public class NonAttrClass : Attribute

class MyClass
   public static void Main()