What is the "storage-url" for repair?

I am backing up to a local disk and to B2. Everything seemed to be working fine until I decided to test a restore from B2 to a different computer. The restore failed, saying “Found 41 files that are missing from the remote storage, please run repair.” When I went back to the main computer, I got the same message. I click on “repair” but nothing seems to happen.

I see an article describing how to run repair from the command line:

Duplicati.CommandLine.exe repair <storage-URL>[<options>]

So my immediate question is: What do I use for “storage-URL” in this command?