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Access violation at address 0000000004224791 in module 'ConnPoolLib.dll'. Read of address FFFFFFFFFFFFFFFF

When I run “Auto Optimize SQL” in Toad for Oracle Xpert 12.1, I got the following error:

Access violation at address 0000000004224791 in module ‘ConnPoolLib.dll’. Read of address FFFFFFFFFFFFFFFF

Invalid pointer operation

Look user that you are using to execute statement in SQL Optimizer … sounds like a wrong one.