Warum funktioniert dieses AppleScript nicht?

Vorweg:
Ich habe es von ChatGPT erstellen lassen (ja, ich weiß ...), weil ich das selbst nicht kann. Es soll einen Arbeitsschritt im Computerservice vereinfachen.
Die Anforderung ist so definiert:

There is a folder on the desktop named "VMEDaction". Inside is a certificate named "Proxy2.cer". This certicivate needs to be added to keychain.app. Also the URL "http://vmed.test.wap" needs to be added in network settings as path to a proxy server.

Das Ergebnis war:

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-- Add certificate to Keychain.app and set it as trusted
tell application "Keychain Access"
    set certificatePath to POSIX path of (path to desktop folder) & "VMEDaction/Proxy2.cer"
    set newCert to (contents of certificatePath)
    set certRef to add newCert with password "" to keychain "login.keychain"
    set trust settings of certRef to {always trust}
end tell
 
-- Add URL as a proxy server in network settings
tell application "System Preferences"
    activate
    reveal pane id "com.apple.preference.network"
end tell
 
tell application "System Events"
    tell process "System Preferences"
        delay 1 -- Wait for the pane to be revealed (adjust delay if needed)
        click button "Proxies" of window "Network"
        delay 1 -- Wait for the Proxies tab to load (adjust delay if needed)
 
        -- Enable Web Proxy (if not already enabled)
        if value of checkbox "Web Proxy (HTTP)" of tab group 1 of group 1 of window "Network" is 0 then
            click checkbox "Web Proxy (HTTP)" of tab group 1 of group 1 of window "Network"
        end if
 
        -- Add the URL as a proxy server
        set value of text field "Web Proxy Server" of tab group 1 of group 1 of window "Network" to "http://vmed.test.wap"
 
        click button "Apply" of window "Network"
    end tell
end tell

Als Ergebnis kommt aber:
Syntax error: Zeilenende, etc. erwartet, aber Identifier gefunden.
Ist das so schlecht programmiert, oder was spricht gegen den Code?

Falls da jemand eine Idee hat, wäre ich äußerst dankbar.