DBMS Buffer Size

I am getting a DBMS buffer overflow error in a PLSQL script I am running. Is there any way to adjust the DBMS buffer size from within TOAD? I don’t see it in the Debugger options. I’m using Toad for Oracle 10.6.1.3.

On that point can anyone recommend or identify any other debugging options in Toad for Oracle other than DBMS?

Thanks.