@linliiq32 welcome to the forum.
If you mean that after installing the plugin Joplin crashed and continues to crash every time you start it, one thing to try first is to:
Ensure that Joplin is fully quit (i.e. not running at all). Then go to...
C:\Users\<username>\.config\joplin-desktop\plugins (where <username> is your account username)
and delete...
com.andrejilderda.macOSTheme@1.3.13.jpl (or whatever version you have installed)
Then restart Joplin.
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