About away3d vertex animation

Some frame are missing when i use md2 mesh, can anyone solve this problem?

I mean in away3d, vertex animation skip frame, no one experienced this porblem?

It’s been a looong time since I last used away3d (it was the as3 version), I remember we used MD5 for character animations : did you try that ? Or another format, I don’t really know what is supported by away3d nowadays.