Hi Rick,
I got the same issue and spent hours understanding what was wrong with my package: comparison with officially listed third-party in github wiki, json file validation, etc...
I finally discovered a wiki page for 1.6.6 telling postfix and prefix file name is mandatory being resp. package_ and _index.json.
This solved my issue but I would follow you in that IDE should tell why it refuses a package given in preferences instead of staying quiet.
PS: the package url in preferences still disallow file:// url, making the validation process a bit more lengthy with needed intermediate uploads to a server.
Thibaut
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Thanks. This helps. It matches my experience exactly. Sounds like it's time to file these as issues on github.
--Rick
Rick,
I created issues 4097 and 4098 to ask for possible improvements.