Won't Add Flights

Hey everyone,

I'm having a bit of trouble adding flights on R1.

I'm trying to fly a Tupolev-104's from DXB to AUH (maximum hours - I definitely have enough slots at both airports), but it doesn't add. When I add it, it starts loading... then goes back into show aircraft. It doesn't even say "can't add aircraft, etc.", or "added 48 weekly flights" etc.

Can someone please tell me whats going on?

Thanks,

- H2O