Have two one handed daggers equipped wont let me use dispatch

I have two one handed daggers equipped. I was using them fine earlier now it tells me I have to have a one handed melee weapon equipped to use dispatch. If a dagger isn’t a one handed melee weapon I am beside myself.

Need big sword / axe / mace for big chop.

A dagger is a “dagger”, not a one-handed melee weapon. Assassination and subtlety rogues require daggers, outlaw rogues require anything other than daggers.

Outlaw needs a Mace/Axe/Sword in the mainhand. You can use dagger in offhand though.