Mercy Stroke Not working for Monk.

http://ffxiv.gamerescape.com/wiki/Mercy_Stroke

Acquired: Marauder (Lv. 26)
Affinity: ACN, ARC, CNJ, DRG, DRK, GLA, LNC, MNK, MRD, PGL
PLD, ROG, THM, WAR

Time: 12;29 CST
Frequency: All the time
World name: Excalibur
Character name: Velt Starcaller
Retainer name: NA
NPC name:NA
Monster name:NA
Class/Level: 60 Monk
Party or solo: Party and solo
In-game time: 7:21 AM
Area and coordinates: Everywhere
Housing: NA
Steps:
1. Assign Mercy Stroke to an open cross class ability slot.
2. Drag that ability to my hot bar.
3. Ability never lights up when fighting mobs under 20% health.
4. When attempting to use ability and error message pops up " Cannot use as current class"

Either the job text for Mercy Stroke is wrong or there is an actual bug preventing me from using the ability.