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Compiler Error CS0438

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The type 'type' in 'module_1' conflicts with the namespace 'namespace' in 'module_2'.

This error occurs when a type in a source file conflicts with a namespace in another source file. This typically happens when one or both come from an added module. To resolve, rename the type or the namespace that caused the conflict.

The following example generates CS0438:

Compile this file first:

// CS0438_1.cs
// compile with: /target:module
public class Util
{
   public class A { }
}

Then compile this file:

// CS0438_2.cs
// compile with: /target:module
namespace Util 
{
   public class A { }
}

And then compile this file:

// CS0438_3.cs
// compile with: /addmodule:CS0438_1.netmodule /addmodule:CS0438_2.netmodule
using System;
public class Test
{
   public static void Main() {
      Console.WriteLine(typeof(Util.A));   // CS0438
   }
}