Oracle doesn't know what this error message is, and it may in fact be erroneous.
Try adding ...
$dbh->do(q{alter session set events '65285 trace name errorstack level 3'});
... after your connection to the database.
A trace file should then be generated.
where? I have searched in $ORACLE_HOME/rdbms/log on server side, but nothing apears.
Silvio
