I recently started a new Grand Duel, and picked out my team. However, when I tried to fight, an pop up came out saying there was an unknown error and that my game session is outdated. Reloading the game didn’t help, neither did updating it. Please help !!
Here’s a picture:

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Edit: same thing happens with classic duels, even though I just did one yesterday and it worked just fine

Me too, some other posts said to clear data and cache. Nothing Is working, and now my daily coins are being wasted. Somebody please fix this.

I have this same problem. I bought the 30 grand tokens and I cant even use them now.

Edit #2: I have done absolutely nothing, but now my game is completely back to normal, and I have no idea why. It appears other people are having the same issue, so please still look into this

I already had this issue and it was back to normal alone, without doing anything.