Read the statement by Michael Teeuw here.
Face Recognition with inferred light
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 Uhm @MichMich could it be that the module fading fails if no module has the class you are trying to fade? 
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 Did some debugging. I’m not an expert in Java at the moment, but isn’t there missing the class Marvin @ module.data.classes ?  
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 Javascript … not Java. Two different beasts. But yes, it’s being looked into … 
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 I did some tests: MM.getModules().withClass('a_non_existing_class') // No issue. MM.getModules().withClass('') // No issue. MM.getModules().withClass()// No issue.So no idea what is causing that problem. 
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 @MichMich hmm how Can i deinstall and reinstall opencv? 
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 Sorry, I don’t have any experience with openCV 
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 @feuerball why do you want to reinstall it? 
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 If it was installed using apt-get, you can remove it the same way, 'apt-get remove --purge <package-name>'. If you compiled the binaries yourself, you can simply do it again and overwrite the previous ones.However, a better question is, why do you want to do that? 
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 @KirAsh4 why apt-get remove --purgeshouldn’tapt-get purgedo the same?



