Drzewiecki Design

I tried using WED to edit it but I am still pretty new to the software and it won't let me export the file with updated gates due to various errors I don't know how to fix. I wonder if I can find an updated WED file anywhere.

I am not sure if this is a Traffic Global or DD issue, but I am wondering how I can change the airline and aircraft assignments at each gate? It's very annoying to see things like united 777s parked at AA gates and AA E-170s parked where the United heavies should be.