ColorfulSidebar 2.1.2 on mojave 10.14.6 cause error in Quicklook plugin for pdf files

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When I disable the ColorfulSidebar plugin in macforge, and restarrt finder, the error does not show up anymore.

I've tried to drag plugin file under ~/Library/QuickLook and /Library/QuickLook to the macforge app blacklist, but that does not work. When the quick look extensions are used, the user application should be finder. But since ColorfulSidebar is a plugin for finder, I don't want to drag finder into the blacklist ⊙﹏⊙|||....

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well, since quicklook for pdf is pretty important for me, I am now disabling ColorfulSidebar for the moment. But I really hope that could be fixed~