In the 4th video of this tutorial project there is building a series of elements in the Network to get the first Spot as in the Screen shot below from the tutorial.

However, for some reason I cannot get this spot to appear.

I have gone over the tutorial three times to double check that I have done the same as the tutorial plus playing around with controls that the tutorial puts in the project that can adjust parameters.

I have also done extra things like closing and reopening the project, window panes etc. in case my problem is just some video glitch.

But I haven't had any success in finding a solution.

If anyone can suggest some things to try or what part of the tutorial to take another look at it would be much appreciated.

Thanks