Hi everyone,
We are aware that this error message from Facebook is popping up frequently when playing the game. It is happening with other games as well. You should be able to click the close button on that message to continue playing but it will keep showing back up until this can be fixed.
The developers have been made aware of the problem.
Facebook are also aware of the problem and have assigned it to a team.
We apologize for the inconvenience, but it does look like we will have to wait on Facebook to find and fix the problem.
You can try working in full screen if you're able to so that you see the message less frequently, but you will still have to close that message when you drop back out of full screen mode.
You can still work facilities for friends even though the error message shows, just close it and the work request will load allowing you to start the work. It will pop up again.
Those with the 2 dispatched trains to help with facility work, once you have closed the message and started working the facilities, you should be able to tell when the work is completed so you can close the tab without clicking the message to close it again, as you can just see the bottom of the mayor message with the ok Thanks on it below the Facebook message. This example shows you where to look, indicated with a red arrow:
UPDATE from Facebook is that they have found the route cause of this issue and their team are working to get it fixed.
We don't know how much work is involved to reverse or correct whatever caused it in the first place, that's not something Facebook tend to go into any detail about. So at the moment there isn't a timeline for when that will happen yet.