Why Does D2nt Say Unhandled Excession Diablo II Lod D2nt Error Only One Copy Of Diablo II May Run At A Time Help Please.?

Diablo II lod d2nt error only one copy of diablo II may run at a time help please.? - why does d2nt say unhandled excession

I configured everything ezactly ... If I am to lead D2NT LOD D2 watch screen, the error just seconds ...