How tf do I get Blueprints to communicate with each other?!

Okay so,
image

In these two screenshots, I set up a BP Interface for items to try and make the bridge between the PlayerBP and the MedkitBP, I thought in theory this should work however on runtime I am getting an “Accessed None trying to read property MedKitRef”. The medkitref is an object reference to the MedKitBP.

What do you think I should do?