Unhandled exception in XYTable.exe: 0xC0000005: Access Violation

when I was running my GUI this 0xC0000005: Access Violation error pops out and on the visual c++ 6.0 debugger its shows line of the code with the error:

m_CurrUnit.ptUnitPitch.x = fnRound((double)pCurrPanel->lUnitXTotalPitch * m_CurrUnit.ptUnitInPanel.x / m_StripInfo.nUxDenominator); 

How do i go about changing the codes or is it because i have some wrong values stored in the setting.mdb file in one of my folders.. Please help I am so confused! Thanks..