"Didn't allow installing X via USB"

[littlebigman]

Hello,

All of a sudden, Android on my Xiaomi Redmi won't run the app I use to sync it with Windows:

https://i.postimg.cc/KY6FPzZw/Screenshot-2019-06-26-22-11-43-009-lockscreen.png

Any idea what I could try?

Thank you.