Invalid data type for column in WRITETEXT or READTEXT

Item Value
SQLCODE -609
Constant SQLE_INVALID_TEXT_IMAGE_DATATYPE
SQLSTATE 53W09
Sybase error code 7139
ODBC 2 State ERROR
ODBC 3 State ERROR

Probable cause 

You referenced a column in a WRITETEXT or READTEXT statement that is not defined for storing text or image data.