Data overflow. Increase specified column size or buffer size

I have created a crystal report using using sybase ASE database tables. but while I am passing the prompt value in the report. I am getting an error message:

"The viewer could not process an event. Error in File:

Database Connector Error: 'HY000:[Sybase][ODBC Driver]Data overflow. Increase specified column size or buffer size [Database Vendor Code: 30128 ]' []
---- Error code:0 [CRWEB00000119]

Can anyone please help me what could be the possible reasons for this error and how to fix it?