try spell 2 (without the dash) or Spell 2. animation names are a bit weird. try looking at some abilities and check their animation names (i think one of paladin spells uses a secondary spell anim)
Replace my HSCaster with your unit. (usually i'd place it in a variable so its easy to refer to, because i know nothing about jass)
Replace the 5 with your animation number.(Open your model in warcraft 3 viewer and view the animations in the tree view window. Animation 1 is usually the 2nd one (Stand) but in some cases it wont, test around)
Ghan has said he has fixed this. Monovertex please confirm this fix. This was only a problem with people that had signatures in the upper levels like not the special members but the respected members.