I noticed you said you had reinstalled Luban.
I have just had the age-old problem of "Something went wrong. Please reload the app”.
Even though I had reinstalled Luban, and even tried the previous version, I still had the problem. That was until I searched the forum and found this:
It seems to have worked for me by deleting the suggested folder, but I can’t be sure I didn’t delete any of my personal set-ups or tool profiles, etc.