Misleading error message when firing Mordo's purple against a team with no coloured AP [Devs Aware]

I noticed this while playing the She-Hulk tournament.  I had triple-cast She-Hulk's green to drain the enemy of AP, and then cast Mordo's purple.  The following error showed up:


Of course, it is the enemy team that doesn't have enough AP for my power to actually do damage: I had enough AP to theoretically use the power.

[and yes, I realise it would have made more sense to use Mordo's power first]

//Edited Title -Brigby