Im unfamiliar with animations, but are you trying to get it to do the walk animation on the same spot? cause then maybe its a case of having the unit move to do it?
The problem is you are unable to play the "walk" animation of units with the GUI functions. You'll need to use [LJASS]SetUnitAnimationByIndex[/LJASS]. Then you'll need to find the walk animation index of the unit's model, which can easily be discovered by playing around with the values or by using Warcraft 3 Model Viewer.
I do know this - xenforo dropped the ball by not keeping the vbulletin reputation comments as a feature. The loss of the Reputation comments data when we switched to Xenforo really was the death knell for the site when it came to all the users that left. I know I missed it so much and I got way less interested in the site when that feature was gone and I run the site.
I'm on a page about incorrect corrections, and spent the better part of like two hours trying to get someone to understand that -5^2 = -25, not 25, and then that post had comments get reposted because that group is self sustaining, and that person was in turn trying to explain what I just explained to them. And I'm taking that as a victory