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

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, it might help to set the readschema parameter either to true or false. For more information: http://msdn.microsoft.com/en-us/library/aw4d600w(VS.80).aspx.