You may receive the following error when you log into a company in Management Reporter 2012 Report Designer that is using the Data Mart provider:
The operation could not be completed due to a problem in the data provider framework
Microsoft.Dynamics.Performance.DataProvider.Core.RequestException: The source system request did not complete successfully. ---> System.InvalidOperationException: Sequence contains no elements
Microsoft.Dynamics.Performance.DataProvider.Core.RequestException: The source system request did not complete successfully. ---> System.InvalidOperationException: Sequence contains no elements