Invalid data conversion: NULL was inserted for column '%1' on row %2

Error constant SQLE_CANNOT_CONVERT_LOAD_TABLE
ODBC 2 state 07006
ODBC 3 state 07006
Parameter 1 Name of the column where NULL was inserted.
Parameter 2 Row number in the data file where the invalid data conversion took place.
Severity 10
SQLCODE 124
SQLSTATE 01W01
Sybase error code 13886
 Probable cause