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If you are not using the latest production version of SQL Developer (3.1.07.42), possibly you are hitting this bug:
Bug 9461849 - SQLDEV2.1: HIT ORA-06502 IN TOP SQL BY WAITS FOR SOME SQL CLAUSES
This was reported in a Chinese language environment, Reports -> ... -> Database Administration -> Top SQL, but has been fixed for 3.1.
SQL Developer Team