Look in both Datapath.cs and OpenUOSDK.cs and if both have the same path, then go to that path and put all files there. If you change the OpenUOSDK.cs, you will need to recompile.
The last two pictures you posted show that you have both DataPath & OpenUO pointed at ServUO itself. If for some reason you moved your UO files inside your 'ServUO-master' directory then I would suggest starting again clean and keep everything separated.