ORA-02248 When I Try to Connect Discoverer Desktop 9.0.4.43.17 to 11.2.0.1

Hi Fellows.
I'm trying to Connect Discoverer Desktop 9.0.4.43.17 to Oracle Database 11.2.0.1. I Installed the program (Windows 7 Emulating XP SP3) But when I try to connect to Database send me ORA-02248 Error, some Alter Session. I'm Using a user with DBA privileges But I cannot Connect to Database, Do I have to Install an Additional Software or create a Special User or Schema????
I would like to check and use Discoverer because I think that will be very usefull for the end users of the company.
Thanks for your time.
Best Regards
Emmanuel.

Dear Friend.
I can connect via SQLPLUS with SYS as SYSDBA and everthing is ok But When I try to do it in Discoverer Logon Form I Can't and i get Error ORA-12154. Can I fix ORA-02248 ALTER SESSION problem Connected from SQLPLUS as SYS???? I was Checking But I cannot Find Nothing Regarding this issue. Its seem the aplicaction when connect Try to ALTER the Session But Fails and the Program Abort. I Also check for SQL Scripts into the Binary Discoverer Directory But Nothing.........I just found a lot of Jar Files.
Thanks a Lot
Emmanuel.

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