Error in Applescript to create named subfolders

Hello,

i'm trying to make a script that creates subfolders for every subfolder of the location you choose, with modified names.

Basically:

• I have Folder/subfolder1, Folder/subfolder2,...
• The script should create Folder/subfolder1/2020_subfolder1, Folder/subfolder2/2020_subfolder2 and so on and so forth

The current error:

"Finder got an error: Can’t get path of folder "test" of folder "Desktop" of folder "johndoe" of folder "Users" of startup disk." - happens on

set myFolderlocation to path of aFolder

Here's my current full code from script editor:

--on run

set theFolder to (choose folder with prompt "Select the folder")

doSomethingWith(theFolder)

--end run


on doSomethingWith(aFolder)
	
	tell application "Finder"
		
		set subFolders to every folder of aFolder
		
		repeat with eachFolder in subFolders
			
			set myFolderlocation to path of aFolder
			my doSomethingWith(eachFolder)
			
		end repeat
		
	end tell
	
	--create the name "2020_NameofParentfolder"; this could be simplified
	set myParentFolderName to name of aFolder
	set mywhataname to ("2020_" & myParentFolderName) as text
	
	--creates the subfolder, with the adapted name i've set before
	make new folder at myFolderlocation with properties {name:mywhataname}
	
end doSomethingWith

Note: I took part of the code from "Iterating through folders" because i don't know applescript too well. https://discussions.apple.com/thread/2716678

I appreciate any help, already spent two or three hours researching but even that's hard with my very low konwledge of applescript.