About idea reporting error “cannot access class”

Reproduced in: https://blog.csdn.net/qq_38728337/article/details/82624617

: Cannot access Backend cannot access Group
Thinking about why the same package will report this error, it must be the IDE problem, Google found that someone wrote feedback on the official website, the official website staff answer: restart try
Results!! Reboot idea is no longer an error, my god [emoticon]

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