Basically, the script in a part is trying to show a GUI whenever a mouse button hovers over it. Heres the script: 
Honestly, I don’t know the issue, the only problem is that in the output it says 
I’ve researched the index nil with PlayerGui and nothing specific to my case has come up. Well, I’m a beginner scripter so I don’t really know how to implement into my script at all.
You can’t use :GetPlayerFromCharacter because it isn’t a instance in the workspace. Just use Clicked.PlayerGui
You can get the player from ClickDetector event (are players, not characters.)
Try this:
script.Parent.MouseHoverEnter:Connect(function(player)
local playerGui = player:WaitForChild('PlayerGui')
...
end)
The feeling I get after looking at code for hours just to find out I forgot to call the function is terrible and amazing at the same time. Thank you, it worked!