Now I have been having more problems with the server. It's the "Try restarting your game" except that when i restart the server and computer, it still won't work. Or it sometimes gives the "bit cannot be cast to fm" issue. Any solution? 
Posts by chemtoast
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It's okay now. the server was restored though some railways i made were in part deleted but i can make them again.
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A few minutes ago i logged into my server, but i spawned somewhere else and EVERYTHING was deleted....
I also did not make a backup... so that's even worse. -
Thank you! It worked!
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I have the same issue as Kreepers2. Since yesterday morning my server won't work. Me and my friends were going to get on the server but all it says is: "Invalid Session. (Try restarting your game)" and i use 1.7.2.