As a dewikisource admin i tried to import this page
https://wikisource.org/wiki/Page:An_Alle,_Alle!_Heft_1,_1919.djvu/1
via
https://de.wikisource.org/wiki/Spezial:Import
resulting in this error message (import error: source page could not be opened)
Is this a bug or did i do something wrong?