{"message":"An error occurred when attempting to evaluate a ContentBlockByKey function call.\r\n  Function Call: ContentBlockByKey(@header)\r\n  See inner exception for details.","description":"ExactTarget.OMM.FunctionExecutionException: An error occurred when attempting to evaluate a ContentBlockByKey function call.\r\n  Function Call: ContentBlockByKey(@header)\r\n  See inner exception for details.\r\n  Error Code: OMM_FUNC_EXEC_ERROR\r\n - from Jint --> \r\n\r\n --- inner exception 1---\r\n\r\nExactTarget.OMM.InvalidFunctionParameterException: The specified content block does not exist.\r\n  Asset ID: \r\n  Function Name: ContentBlockByKey\r\n  Parameter Name: CustomerKey\r\n  Parameter Ordinal: 1\r\n  Parameter Type: Text\r\n  Submitted Value: _Global_Logo\r\n  ClientID: 7000682\r\n  JobID: 0\r\n  ListID: 0\r\n  BatchID: 0\r\n  SubcriberID: 0\r\n  Data Source Type: List\r\n  Error Code: OMM_INVALID_FUNCT_PARAM\r\n - from OMMCommon\r\n\r\n\r\n\r\n"}