C:\Users\ユーザ名\AppData\Local\Arduino15\package_index.json C:\Users\ユーザ名\AppData\Local\Arduino15\cache
📣 UPDATE 📣
— Arduino (@arduino) June 10, 2020
We recently had a problem in our package_index.json that caused an error and prevented the IDE from starting. It has been fixed; however to recover a working installation, you must delete the package_index.json once again and restart the IDE as usual.
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