I uploaded my list from the search box.
The list is SPCC23B6.03c, SPAC13C5.07, SPAC1556.01c, SPBC6B1.09, SPCC338.08, SPBC216.05, SPCC1259.13, SPAC664.07c, SPAC20G4.04c, SPAC1952.07, SPBC342.05, SPCC622.08c, SPAC19G12.06
However, nbs1 does not appear in the resulting network.
I know it should, because it is part of a tripartite complex with mre11 and rad50 see fig nbs1 which shows this int eh cell cycle regulation network
fig "starting network" is what I see from this list.
I don't know if any other genes are missing. My preferred behavior would be like STRING, where the genes which are in your list, but not in the network are shown as unconnected nodes. Otherwise, you need to check one by one which are missing which isn't practical for large lists.