i have set up my Calibre content server in Moon+ Reader pro. I can see the catalog, search it, even read a book on it. But every time I try to download said book, it gives a 'error:null' and doesn't do anything. any pointers?
Not a Moon+ user so cant help with that, but you can always doewnlaod the bok using a browser and then import it into Moon as a workaround.
I have no problem connecting Moon to Calibre Content Server.

Make sure you add /opds to the end of the catalog path.

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