Unable to delete database file

Error constant SQLE_BACKUP_UNABLE_TO_DELETE_FILE
ODBC 2 State ERROR
ODBC 3 State ERROR
Severity 16
SQLCODE –243
SQLSTATE WB004
Sybase error code 13660
Probable cause

You attempted to delete a database file, but it could not be deleted. The file name should not be the same as any database file that is currently in use.