I need help resolving this error. I got this error this morning on the new pc I am setting up. As far as I can remember it was working yesterday when I shut down. After I got this error I blew away the Oracle 8.0 client that was on the on it and have installed Oracle 8.1.7 client on my new Dell GX110 . I still get this error when trying to connect using SQLPlus or one of my Oracle apps. I copied my TNSNAMES.ORA from my old machine and have defined new connections with the network assistant. My TCP/IP works fine and I can connect to a unix server and use SQLPlus there. I couldn't deinstall the 8.0 using the 8.1.7 de-installer so I drug them to the trash and flushed them. What causes this error? What do I have to do to fix it?