TF291002: An error occurred while communicating with Project Server. The server may not be valid, a network problem might exist, or you might not have permissions to perform this function. If the problem persists, contact your Project Server administrator.
TF291019: A validation error occurred while uploading Project Server mapping data. The '{1}' element that maps to the Project Server field '{2}' requires that the '{0}' attribute is set to '{3}', and not set to '{4}'. Correct the field mapping for Team Foundation Server and Project Server integration.
TF291020: A validation error occurred while uploading Project Server mapping data. The '{1}' subelement of the '{2}' element that maps to the Project Server field '{3}' requires that the '{0}' attribute is set to '{4}', and not set to '{5}'. Correct the field mapping for Team Foundation Server and Project Server integration.