The se:webservice call has it's resulttype set to DataTable, but the result could not be loaded into a dataset.

When the resulttype of the se:webservice macro has been set to DataTable, the response will first be loaded into a DataSet. Then, from the DataSet, the first DataTable will be returned.

If loading the response fails with this exception, you should inspect the exact error message for any clues why it fails.

You could also try to setting the resulttype to string or use inline formatting xml to display the "raw" result. This way, you will be able to see the exact response and might be able to figure out why it fails to load into a DataSet.