Whats wrong with this simple skill??

Just want a mob to glow when players get near it.
Can't get this to work...

Skills:
- skill{s=MeteorGlow} @self ~timer 20

MeteorGlow:
Conditions:
- playerwithin{d=6} true
Skills:
- potion{type=GLOWING;duration=60;level=1;} @self