I have installed Oracle Designer R2.1.2 with Oracle database 8.0.5, when I want to created a new Application name it caused many errors.

Errors massage:
RME-00011 Operation 'open' on activity was failed.
RME-00020 Internal API error - ORA - 06508 could not find program unit being called.

Errors detail :
RME-00222 failed to dispacth operation to repostory.
RME-00223 failed to open new activity.

Anybody would like to help me, please.