Yandex.Disk: why does the error "this folder cannot be selected" occur?

Question

Yandex.Disk

For a week now I have been struggling with the problem of choosing another folder for synchronization in the Yandex.disk client for Windows. When trying to change the dad, he writes the following: "This folder cannot be selected. It is already on the Yandex disk."
I read that you need to sort of delete the hidden .sync folder that is created on the disk, but this does not help me. It cannot be deleted while the client is running, you close the client, delete the folder, start it again to change the directory for synchronization, but the client immediately creates the .sync folder back and everything over again. I don't know what to do anymore.
Who successfully solved this problem?

Answer 1

Try:
Turn off the program:
Remove .sync;
Rename the root ass (to which the Y.D. synchronization is configured);
Log in - specifying the required folder.

Answer 2

The .sync folder must be deleted not in the current Yandex Disk directory, but somewhere near the one you are going to select.
For example, for the path "D:\Cloud\YandexDisk" I had to delete the .sync folder located on the D:\