"No targets match selectors "when using ~onAttack ~onTimer .etc.

Have Installed CrucibleV1.4 and MythicmobsV5.0.4,and I tried to create an item which used the skill "command" to be triggered by players' attacking Entity.But it doesn't work at all. Once I attack a mob with the item,the console said"No targets match selectors". [Legacy attachment omitted] By the way,the trigger"~onTimer"doesn't either.I don't know the others' situation. But I found ~onUse ~onConsume ~onSwing(Maybe there are more than the 3) worked well.