ssl cert installed but website not secure [Resolved]

Hello and thanks for trying to help me.
Update: this was fixed by installing a plugin "SSL Insecure Content Fixer "

Clicking on "Not secure" in the url produces :
Validity Period
Issued on: (today's date)
Expires on: (3 months from now)

Whynopadlock produces Mixed Content-Errors as in the screenshot below.

Any suggestions ?

certbot renew --cert-name --force-renewal
Processing /etc/letsencrypt/renewal/
Failed to renew certificate with error: The manual plugin is not working; there may be problems with your existing configuration. The error was: PluginError("An authentication script must be provided with --manual-auth-hook when using the manual plugin non-interactively.")
All renewals failed.


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