ERROR: Item has already been added. Key in dictionary: 'avatar

Topics: Business Logic Layer
Feb 26, 2014 at 6:14 PM
When I try to run source code with my SQL Database, I get this error:

Server Error in '/' Application.
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Item has already been added. Key in dictionary: 'avatar'  Key being added: 'avatar' 
  Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. 

 Exception Details: System.ArgumentException: Item has already been added. Key in dictionary: 'avatar'  Key being added: 'avatar'