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Why my code don`t work

Proc := TUniStoredProc.Create(nil);
Proc.Connection := TUniConnection;
Proc.StoredProcName :='GenerateMark';
Proc.PrepareSQL;
//Proc.Prepare;
Proc.ParamByName('id_warbo').AsInteger := 0; <- here is stop field not exists

In order to investigate the issue, we need a need script that creates the stored procedure where the issue occurs. Please also specify your database system and version.