This error comes up when you have not installed the opencv module in the system. Hence, you will need to check if this module is available or not. Use the below command to check the same.
$ pip list or conda list
If the module is not available, then install the same using the below command.
$ pip install opencv-python or conda install opencv-python
Also you need to check if the numpy module is available or not. You need to install numpy if it is not available.
$ pip install numpy
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