Raised exception class eaccessviolation with message 'Access violation ataddress 64ff0002. rea

I recently learned about Delphi and encountered a very difficult problem. After finding N for a long time, I finally finished it myself. It was a very low-level error.

Project myproject.exe raised exception class eaccessviolation with message 'Access violation at address 64ff0002. Read of address 64ff0002 '. process stopped. Use step or run to continue.

It turned out that I declared two toraquery objects and called them directly without creating them. I was depressed.

My two projects have segmentsCodeIt is repeated. I copied the code of the first project and modified it directly. There are too many codes. When I did not pay attention to the changes, I killed the two codes that I created. Now, I lost my temper and almost killed me.