The optimizer was unable to construct a valid access plan

Error constant SQLE_CANNOT_OPTIMIZE_QUERY
ODBC 2 State ERROR
ODBC 3 State ERROR
Severity 18
SQLCODE –727
SQLSTATE WI010
Sybase error code 13730
Probable cause

The database server was unable to construct a valid access plan for the given request. This is a SQL Anywhere internal error. If it can be reproduced, it should be reported to iAnywhere. You may be able to work around this problem by modifying the query statement.