Error in "predict" in the "Gesture Recognition using Videos and Deep Learning" example

I am trying to run the example of Gesture Recognition using Videos and Deep Learning in Matlab. However, when the code reaches to line:

dlYPred = predict(slowFastClassifier,dlVideo);

Matlab returns the error:

Error using predict
No valid system or dataset was specified.

I have installed Computer Vision Toolbox and Deep Learning Toolbox. I have also installed Computer Vision Toolbox Model for SlowFast Video Classification.

How to resolve the issue?