Full Name:
vs.csharp.enc.error_4054

Short Name:
vs.csharp.enc.error_4054

Type of Entity:
C#

Abstract:
This error occurs if you try to modify a method, property, indexer, or operator containing a yield return or yield break statement. For more information, see yield (C# Reference). Edit and Continue does not support this change during debugging.

MSDN Source URL:
http://msdn2.microsoft.com/ms164968.aspx