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Microsoft Dynamics CRM - 2011 - Error when Creating Field Mappings: Unhandled Error in Silverlight Application

Knowledge Article Number 000212792
Description When going to the field mapping configuration in Microsoft Dynamics CRM 2011 on-premise or online, the screen presents an Error on Page warning in the bottom left corner of the screen. When you click the error, it provides the following details: 

Webpage error details:

User Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0; .NET CLR 2.0.50727; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729; .NET4.0C; .NET4.0E) 
Timestamp: Wed, 28 Sep 2011 12:00:38 UTC 

Message: Unhandled Error in Silverlight Application [Arg_NullReferenceException]
Resolution Follow these steps to resolve this error:

1. In Microsoft Dynamics CRM, select the Advanced Find option.

2. In Look For, select ExactTarget Configurations.
3. Click the exclamation mark (!)  for the results. 
4. Double click the record that is returned.
5. Verify that the OAuth Application ID is blank. 
6. For this value, input: 6C7F3A46-9BFD-40E9-87EE-456577D4FFE7 
7. Click Save & Close.

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