A patch for this issue has been pushed and should now be mitigated.
Thank you all for your cooperation and if you encounter any further issues be sure to contact our Support team (email below).
We are investigating an issue currently being identified as Error 121 that is affecting certain players. If you are experiencing this issue, please do let us know the following:
Your Player Level
Your last Tournament participation
The last time you launched the App prior to the Error
Ok I’m level 19
Participated in the common tournament last weekend and the last time I successfully launched the app was at 4:36 pm GMT, so about 2 and a half hours ago. I tried launching it at 5:pm GMT but it failed. Dunno if this could help, but the last thing i did on the game was purchase some boosts
Level 20, no tournament participation, app last launched about 4 minutes ago, only makes it to 18/24 then I get the error. Last successful app launch was about 5 hours ago.