Could not execute backup/restore DLL (%1) entry point

Error constant SQLE_BACKUP_ENTRY_NOT_FOUND
ODBC 2 state ERROR
ODBC 3 state ERROR
Parameter 1 The name of the entry point that could not be found.
Severity 19
SQLCODE -692
SQLSTATE 08W45
Sybase error code 13719
 Probable cause