What's wrong with this trigger?

[Crimson]

I want to make Attribute Bonus auto-level when my heroes go past level 10 but it won't work. Can someone tell me what's wrong with this? I gave Attribute bonus a level requirement by the way. The heroes can learn it starting at level 11.

• Attribute Bonus
  • Events
    • Unit - A unit Gains a level
  • Conditions
    • ((Triggering unit) is A Hero) Equal to True
    • (Level of (Leveling Hero)) Greater than or equal to 10
  • Actions
    • If (All Conditions are True) then do (Then Actions) else do (Else Actions)
      • If - Conditions
        • (Level of Attribute Bonus (10 Levels) for (Triggering unit)) Equal to 0
      • Then - Actions
        • Unit - Set level of Attribute Bonus (10 Levels) for (Triggering unit) to 1
      • Else - Actions
        • Unit - Increase level of Attribute Bonus (10 Levels) for (Triggering unit)

EDIT: Never mind. I figured out what's wrong. Silly me. I had to add the ability first.