解决办法：

\1.delete C:\Users\Administrator\AppData\Local\JetBrains\IntelliJIdea2020.2 all files（note：Administrator change to your account）
\2. delete C:\Users\Administrator\AppData\Roaming\JetBrains\IdeaIC2020.2 all files （note：Administrator change to your account）
\3.delete (register) \HKEY_CURRENT_USER\Software\JavaSoft\Prefs\jetbrains