Trigger animation cause the player to move another postion.

Hi all,

i watched this tutorial: http://unity3d.com/learn/tutorials/projects/stealth/player-animator-controller

and tried to implement the next scenario: i have an airplane that need to roll when something happen. i created a roll animation, add an animation clip and animation controller. in animation controller i setup a variable "roll" and empty animation with transition to roll animation when the variable roll= true. in my code i used:

 anim.SetBool("roll",true);

the animation play but the player doesn't keep his position and jump back to origin. i tried to nest my player with empty gameobject but it didn't help.

i tried t use animation.play("roll") but the animtion doesn't play.

any suggestions?