universalviewer
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Show an error message when an incorrect manifest URL is provided
https://www.universalviewer.dev/#?c=&m=&cv=&xywh=-2167%2C-198%2C6901%2C3936&manifest=https://wellcomelibrary.org/iiif/b18035723/blah
Also fix this: https://github.com/UniversalViewer/universalviewer/wiki/Gotchas,-Tips,-and-Tricks#your-log-in-attempt-did-not-appear-to-be-successful-please-try-again