클릭시 처음에 호출하여 데이타를 불러옵니다.
근데 다시 버튼을 눌러서 불러오면 에러가 납니다.
에러내용은 아래와 같습니다.
First chance exception at $7C812AEB. Exception class EAccessViolation with message 'Access violation at address 00403340 in module 'Project1.exe'. Read of address 00000230'. Process Project1.exe (1852)
여러분의 조언 부탁 드립니다.

void __fastcall TForm1::Button1Click(TObject *Sender)
{

int i=0;
DataModule3->SQLConnection1->Open();
    //사용자 트리를 먼저 읽어서 트리뷰에 뿌린다.
        AnsiString readSQL="select * from sosok_info where ssi_exist_yno=1";
        ShowMessage(readSQL);
    DataModule3->SQLQuery1->SQL->Clear();
    DataModule3->SQLQuery1->SQL->Add(readSQL);
    //DataModule3->SQLQuery1->ExecSQL();
    DataModule3->SQLQuery1->Open();
  //    ShowMessage(DataModule3->SQLQuery1->RecordCount);
    if (DataModule3->SQLQuery1->RecordCount!=0) {


    DataModule3->SQLQuery1->First();
    TreeView1->Items->Clear();
    //TreeView1->Items->Add()=0;
    while(!DataModule3->SQLQuery1->Eof){

           StringGrid1->Rows[i++]->Add(DataModule3->SQLQuery1->Fields->FieldByName("ssi_title")->AsString);
            TreeView1->Items->Add(TreeView1->Selected,DataModule3->SQLQuery1->Fields->FieldByName("ssi_title")->AsString);


        //}

        DataModule3->SQLQuery1->Next();

    }

    DataModule3->SQLQuery1->Free();
 

    }
   //    DataModule3->SQLConnection1->Connected=false;
   DataModule3->SQLDataSet2->Active=false;
   DataModule3->ClientDataSet2->Active=false;

      DataModule3->SQLConnection1->Close();
}