Oracle BD Error ORA-24374 when trying to display tables on Database view

Hi,

I'm using PowerBuilder version 12.5.2 Build 5006 and an ORACLE Database 11g Xpress Edition.  Both running over the same PC with Windows XP SP3.

I can connect to the database via DB profiler and open a conection in Database View.  I can even run an SQL statement on the ISQL Statement tab.

The problem is when I try to display the tables in the Objects tree view.  Once I click over the plus sign I get the ORACLE Error: "ORA-24374: define not done before fetch or execute and fetch".

I get the same message when I try to create a Datawindow using "SQL Select".

I appreciate any help.

Thanks in advance.

Raúl Luces