How to convert Ecollision Chanel into EObject Type Query

I wanted to get actors in range by clicking on the mouse. But I couldn’t put the actor’s model into an array. It showed that I could convert Ecollision Chanel to EObject Type Query. But it failed. I wanted to know how to do it.
我想通过鼠标点击获得范围内的actor.但是无法把actor的模型放入数组.显示可以把 Ecollision Chanel转换 EObject Type Query.但是失败了.我想知道应该怎么做到