A.I. vanish while climbing a ladder

[SouthSaturnDelta 1]

Hi folks, another fine mess...

  I get my group to climb into a heli.

they go to the ladder beneath it and start to climb ( or rather they grab hold of it and look as if they are about to climb up)

then they vanish up into the heli.

<table border="0" align="center" width="95%" cellpadding="0" cellspacing="0"><tr><td>Code Sample </td></tr><tr><td id="CODE">_para domove [getpos _ladder select 0, getpos _ladder select 1]

@unitready _para

_para action ["ladderup",_ladder]

~7.8

_para moveincargo this

I tried altering the delay to a larger value, but iots still the same.

Is this animation 'ladderup' a custom thing ?

do I need to make my own animation for them to use?

Cheers,

SSD