Board Thread:Tapped Out Help/@comment-78.148.180.150-20150811191448/@comment-26143371-20150811201300

Probably just a temporary issue, which will fix itself soon. I haven't heard of any recent connection problems with the server, but that might totally be possible now that everybody wants to play the event.

What you can try though is restarting your device(s) and clearing the cache. Often that's all what is needed. Sometimes it also helps to switch from mobile data to WLAN or vice versa.