Exporting animation

Hello, I have a problem when I create an new animation in the modelef.xml file : when I try and export it from 3dsMax9, I receive successively two error messages : 1. No definition found for animation "nom name of the animation"2. Ending an animation which was not started Node = "name of the part" Anim = "name of the animation" curAnim = I get these messages even when I only try and modify the name and GUID of an otherwise perfectly working animation. I.E. : "door_0" into "Duplicate_of_door_0_000" and a GUID different from the original one. Has anybody had this problem and is there a solution to it ? Thanks in advance,