PlayerCharacter reference is not compatible with Self

Hello everyone.

I’ve been attempting to follow [this][1] tutorial to set up a tile-based inventory system, and I’ve enountered an error that has stopped my progress dead in its’ tracks.

When I attempt to connect the pins the gentleman in the tutorial does, I am met with this error:

Here’s the interface function it’s attempting to call:

I’ve checked a few times, and I’m pretty sure I’ve set it up the same way as him. What could be causing this error?

Thanks ahead of time!

I figured it out on my own- The issue is that I was using Action Interface Calls instead of action interface Messages.