We cannot help you unless you show us what you are doing with a screenshot that reveals all of the changed properties of the layer that has the problem. There are so many things you could be doing wrong and nobody here has the time to go through the tutorial then try and figure out what errors you have made without seeing your project. If you added an expression you probably just made a typo.
Your right sry bout this
Here are the expressions i wrote
This expressions were all acording to what the Tuturial explaind ... But now here is what it happens:
Moving on the X's
Moving on the Y's
Moving on the Z's
As you can see ... the particule move with the Null Object on the X's and the Z's ... but it does not do that on the Y's
I was hopping some one could tell me why ... since the expressions seam to be right.
You mention "3D Stroke Effect". Are you trying to use the 3D Stroke pluging from Red Giant Software & Trapcode? Is it installed on your machine?
No i am not using any 3D Stroke Plugin nor trapcode.
The Only thing i am using are the built in tolls that AE already has, like "CC Particle World"
And the Tutorial that i am trying to follow is this
It says 3D ... because on the tutorial ... the person make a basic 3D room using only images making them 3D manipulable, By pressing F4, and activating the 3D check box.
But i am only needing the Stroke effect it self ... and the thing should be working fine ... but it isnt
I wish I had the time to look at that tutorial, but I don't. I suspect you made a mistake in following it. Look at the settings for your particle life.