Creating obstacles with decorate.

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 I'm trying to make custom obstacles with decorate. They display in the editor, but not in game. Does anyone know why? The file name for the sprite is URC1A. Below is the decorate code.

 

ACTOR Urchin : TallGreenColumn 502
{
  Radius 1
  Height 7
  ProjectilePassHeight 0
  +SOLID
  States
  {
  Spawn:
    URC1 A -1
    Stop
  }
 }

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As it turns out, it's very important that the sprite's names end in a 0.