I've managed to get my wheels to rotate, but how can I get them to turn in the same direction as the box when it starts to move sidewise? ? I tried to create an angle with the origin of Part 1(Assembly 2:2) and the "golv", but it interfeared with other constraints.
I took a look at you model and in Assembly 2 you need to ground Part33.
After that you need to suppress Angle 5.
You will need to suppress the angle for each of the caster sub-assemblies.
On a side not I noticed that your files were all created with Inventor 2013 RTM.
You might want to let your instructor and IT know that there are service packs and updates.
I hope that this helps.
It still says that I'm unable to animate. "Model has failed to update for the current time. Please correct the animation definition."