UMG widget not displaying menu when clicked

Hi all,

First time posting here and a beginner using UE4. I have been following a lot of videos from Unreal Engine YouTube channel and have really enjoyed what I am learning so far.

However, I have hit a bit of a snag and cannot seem to find a way to resolve it.

I am currently doing the UMG UI Inventory videos being taught by Wes Bunn. On this particular [video][1], he shows how he was able to make the BP to show the Inventory menu when the button has been clicked. Problem is, when I click the Inventory button (after picking up an item of course) nothing happens. I have checked the video and subsequent videos after this to see if I missed anything and it all seems fine. I just cannot get the menu to appear when I click on the item I have picked up!

I have attached 3 pics:

First pic shows the Inventory empty
Second pic shows the Inventory with the item picked up
Third pic shows that the menu does not appear when the item in the Inventory is clicked

Any help would be greatly appreciated! Thank you!

Oh just realised I didn’t include a pic of the BP script.

Sorry forgot one more pic to add! This was the error message I get after I stop playing the game!

253725-message-log.jpg