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Compiler Warning (level 1) CS0658 

Error Message

'attribute modifier' is not a recognized attribute location. All attributes in this block will be ignored.

An invalid attribute modifier was specified. See Attribute Targets for more information.

The following sample generates CS0658:

// CS0658.cs
using System;
public class TestAttribute : Attribute{}
[badAttributeLocation: Test]   // CS0658, badAttributeLocation is invalid
class ClassTest
   public static void Main()