Mehdi

Hi, after being inactive for a very long time I decided to return to the game. However, there is one problem that prevents me from playing : I am unable to create new trade offers. I've tried numerous times but I still get the same message error as you can see in the file attached. I have enough ressources, I select the right parameters each time, so I really don't know where the problem is. Any help will be very much appreciated. Thank you,