error: dataset

Parser Error Description: An error occurred during the parsing of a resource required to service this request. Please review the following specific parse error details and modify your source file appropriately.
Parser Error Message: Unable to convert input xml file content to a DataSet. Column requires a valid DataType.
Source Error:
Line 1: <?xml version="1.0" encoding="utf-8"?> Line 2: <xs:schema id="DataSet1" targetNamespace="http://tempuri.org/DataSet1.xsd" xmlns:mstns="http://tempuri.org/DataSet1.xsd" xmlns="h ...