Need help to delete broken folder from Nextcloud. Can't sync files

Trying to fix this issue I made another one on another Nextcloud user.
I had an error in my Nextcloud client “server replied: Locked”
I tried to make folder and upload file by myself, I didn’t make it.

This is my hard drive on my Nextcloud server. There are no such folder as Case

root@ubuntu-nc:/mnt/files/data/username/files/Изображения# ls -l
total 4
drwxr-xr-x 43 www-data www-data 4096 сен 9 15:33 фото

This is from my Nextcloud interface. In folder Case massege that I don’t have permissions for this folder

This is my ls from client computer:

username@ubuntu:~/Изображения$ ls
Case фото

In my Nextcloud client app I have this error:

This is log from Nextcloud

So I need somehow to delete broken folder Case from Nextcloud.