Acronis Cyber Files: desktop client error "The path has been selected by another user"

Symptoms

You attempt to create a local sync folder.

Creation attempt fails with the following error:

The path has been selected by another user

Solution

The message "path has been selected by another user" is displayed when a different user has already selected that local sync folder already. The same folder on a computer cannot be selected by multiple users of that computer. Please select a different folder.