Not able to register a new lib

Hi,
I tried using the command:

platformio lib register arancino-library/library.json at dev · smartmeio/arancino-library · GitHub

but I obtained the following error:
Invalid URL or broken manifest. Please validate it with http://jsonlint.com

Using jsonlint with the file content report a valid JSON.
Any help or suggestions?
Thanks
Mimmo

That’s a link to the github web view of file, not the file itself. You want the raw file link :

Try:

platformio lib register https://raw.githubusercontent.com/smartmeio/arancino-library/dev/library.json

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