Board manager not finding adafruit package index.json

[jfrankfort]

Hi, I've seen a lot about this but the issue I found and its solution was not discussed (that I found anyway
The problem is that adding https://adafruit.github.io/arduino-board-index/package_adafruit_index.json to the optional board manager urls text box resulted in an error...file not found. When I looked at the text file containing my preferences (with Notepad) , there was an extra space in the URL (just after the last "/"). I deleted that and saved it....and the issue was resolved. The location of the preference file is below. Why this is happening....no idea. I don't see the space in what I paste and I first pasted into Notepad, and then copied and pasted from notepad into the text box.
I just wanted to put this out there because I've not seen it discussed before.
Cheers.....jimf
file location: C:\users*you*\AppData\Local\Arduino15\preferences.txt

[jfrankfort]

OK, I just looked at the document I got the URL from and there is a line break just after the last "/" . When it gets pasted into notepad or directly into the text box, the line break becomes a space.
I wish I noticed this sooner....perhaps this will help someone else. Ciao!