Just tested this myself. No error whatsoever
Here's the solution
1. Remove existing mod
2. Install game directly from Playstore
3. Complete the tutorials ( there are two parts, one about 900mb, another one about 800mb ). When you can freely navigate through the UI, when YUI-chan ask you to explore yourself & when the login reward appears, it means you have completed the tutorial.
4. Now, go to Menu -> Setting -> Account to bind your account. Sign up first if you don't have existing BANDAI account. It should say account binding is completed if you have done correctly.
5. Close the game and go to your Android/obb folder find "com.bandainamcoent.saovsww". Rename it to something else, e.g. "com.bandainamcoent.saovswwABC" ( Install X-plore if your file manager cannot view obb files )
6. Uninstall the game.
7. Install the mod apk provided by Yaska
9. Go to your Android/obb folder & rename back from "com.bandainamcoent.saovswwABC" to "com.bandainamcoent.saovsww"
10. Enable overlay permission
11. Open the game. Transfer account in the login screen (Top left icon)
12. It will says transfer successful and enter the game
13. Game will start to redownload data about 1.7gb
14. After that you will enter to main menu
15. Restart the game & login. Notice there are no error codes appearing.