Parser Error when checking if folder exists

[Ryan Jarvis]

Getting the following error on the attached valid script

<compare expression>, <filter reference>, <multiplicative expression>, <object reference expression>, through or thru expected, got 'exists' (at line 6)

property folder_path : ""
set folder_path to choose folder with prompt "Pick a folder to clean:"
set folder_path to folder_path as text

tell application "Finder"
    set folder_exists to folder folder_path exists
end tell