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the error means, that your cascade.xml file was not loaded, when you tried to call detectMultiScale().

check, that you uploaded the resp. xml correctly, that it can be found from your code, add some debugging code around the CascadeDetector constructor or the load() function.

the error means, that your cascade.xml file was not loaded, when you tried to call detectMultiScale().

check, that you uploaded the resp. xml correctly, that it can be found from your code, add some debugging code around the CascadeDetector constructor or the load() function.function (should return True)