To be honest I have never seen an error thrown just by opening the tool up other than when the files were not uploaded into the library directory in the first place. Did the tool work for you before or are you just trying it out for the first time?
When I click 'proceed' with those strings the page reloads, unchanged.
I'm confused. I'm thinking "XYZ" shouldn't be involved as it was just part of my example... I have many posts with many different attachments shown like this:
I was on a cloud server that used static directories for the obvious. I've since moved the a dedicated and now see some images are broken, pointing to a static directory. Can I replace the static.mydomain so they will all work again?