Applescript click action working, but generating a System Events error
This code works great. Please pay attention to "radio group 1" part. Took me several hours to figure that out. :-/

tell application "System Preferences"
    activate
    set current pane to pane id "com.noodlesoft.Hazel"
end tell
tell application "System Events"
    tell process "System Preferences"
        set frontmost to true
        click radio button "Info" of radio group 1 of window "Hazel"
        delay 1
        click button "Stop Hazel" of group 0 of group 0 of window "Hazel"
    end tell 
end tell