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-- version: 2.4.9.1

this is outdated, no more maintained and does not contain any dnn module.

please uninstall it, and try to reinstall your 4.0.1

later, don't forget to

#include <opencv2/dnn.hpp>

in your code.

-- version: 2.4.9.1

this is outdated, no more maintained and does not contain any dnn module.

please uninstall it, and try to reinstall use a recent release instead

(try not to use your 4.0.1bad package manager here ..)

later, don't forget to

#include <opencv2/dnn.hpp>

in your code.