Scheduled Refresh Failing

Hi,

I'm hoping somebody can help me understand this error message.

The dataset refreshes fine in Power Bi Desktop, but fails during  my daily scheduled refresh.

This has been happening for over a week, I'm unable to find any help elsewhere and don't know where to try next.

Many thanks 

{"error":{"code":"DM_GWPipeline_Gateway_MashupDataAccessError","pbi.error":{"code":"DM_GWPipeline_Gateway_MashupDataAccessError","parameters":{},"details":[{"code":"DM_ErrorDetailNameCode_UnderlyingErrorCode","detail":{"type":1,"value":"-2147467259"}},{"code":"DM_ErrorDetailNameCode_UnderlyingErrorMessage","detail":{"type":1,"value":"<pi>5 arguments were passed to a function which expects between 2 and 4.</pi>"}},{"code":"DM_ErrorDetailNameCode_UnderlyingHResult","detail":{"type":1,"value":"-2147467259"}},{"code":"Microsoft.Data.Mashup.ValueError.Arguments","detail":{"type":1,"value":"{Table.FromRecords({}), \"Index\", 1, 1, number}"}},{"code":"Microsoft.Data.Mashup.ValueError.Reason","detail":{"type":1,"value":"Expression.Error"}}],"exceptionCulprit":1}}} Table: ppm_dwh DWH_EMR_ORACLE_FIN_GRAPH_V.