Dear friends Nils, xtalax, Chris and all of you!
Thanks a lot 
Now MethodOfLines works perfectly on the Heat example provided in the documentation page. I will test all examples
I hope one day I can help the community too, if not in programming, it could be in modeling and/or capturing couplings in science in general. This is the strength and the outcome of your approach.
The best thing for me now, is to continue learning and use the philosophy of SciML to solve models in my field.
Many thanks
Naceur