Cannot find misfitTech SAMD Boards in Arduino board manager.

[Daza Doza]

I followed the instruction provided in the following link, 

http://misfittech.net/blog/arduino-package-install/

I installed 

But I could not find  MisfitTech SAMD boards for installation using .json file provided in the above link.

I manually add  the board library, but I think Arduino does not have auto compiler. 

Any suggestion how to fix this problem?

Thanks

[Daza Doza]

Well, I tried these steps, 

• Click the link at the line following File > Preferences > More preferences can be edited directly in the file. This will open the Arduino15 (or similar name) folder.
• Delete all files except preferences.txt. Please be very careful when deleting things on your computer. When in doubt back up!
• Tools > Board > Boards Manager

Now I can see MisfitTech SAMD boards,

But I am getting error message when I pressed installed.

Any. ideas.

[Daza Doza]

I solved the problem. 

I delete the packages folder which is located under ..../Arduino15/stages/packages. Problem is solved.