Game Manager incomparably

Hello and good day.

I am following a tutorial at https://www.raywenderlich.com/ and having some troubles.

When I try to connect a get game manager to shapes collected it either does not connect nodes or does connect and I get an error message from the compile button.

Why am I getting this and how do I work around this problem?

Here is the tutorial: Unreal Engine 4 UI Tutorial | Kodeco