Invalid data type for column in WRITETEXT or READTEXT

Error constant SQLE_INVALID_TEXT_IMAGE_DATATYPE
ODBC 2 State ERROR
ODBC 3 State ERROR
Severity 16
SQLCODE –609
SQLSTATE 53W09
Sybase error code 7139
Probable cause

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