Before reviewing the SQL*Net logfiles I'd take a deeper look at the alert.log; most certainly the error is logged there. If it's a ORA-600 or ORA-7445 you should patch your database / forms with the latest patches and retry before logging a SR with oracle support.
Thank you. What location can I find those alert files?
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The alert log is located on the database server; it depends on your database server version where exactly
for e.g. 10gR2 or lower: Managing Oracle Database Processes