Email Server Issues

Hello,

So ive set up CyberPanel on my VPS. Ive gotten all the records done and set up the email server, it seems that the DKIM certificate is not vaild and not letting me send emails to gmail accounts along is sending the emails to spam on non gmail accouunts. I try to generate a DKIM cert in the settings for both .com and mail..com

error:
[Errno 13] Permission denied: ‘/usr/local/CyberCP/lib/python3.10/site-packages/tldextract/.suffix_cache/publicsuffix.org-tlds/de84b5ca2167d4c83e38fb162f2e8738.tldextract.json.lock’

Any ways to fox this?

Thanks