Source from the official Some players have been experiencing an issue preventing them from logging in. We apologize for any inconvenience this may have caused. Issue: Due to the region and language settings, an error preventing login occurred during data conversion <For Android users> Update the app on TapTap, and then log in. The issue will be resolved. <For iOS users> We are currently submitting the update request to the App Store. Please wait until the update is ready.

I was having the same problem if the update not available on TAPTAP, all you have to do is search in your web browser for the APK 1.0.24 that's the latest version, download that and install over the current version of the game, then it will let you login and it's updated, easy!