TheoTown

Thank you for telling me how to solve this problem. But I managed to fix it back then, on April 27. I just forgot to inform you.

There is a region. It was all open and you could build cities on it. After the error appeared, the cities remained in place, but they were not available. It was necessary as the very beginning to open them waiting for time. If you start to open, then after some time they were closed again. And so on...