Letsencrypt certbot renew error __str__ returned non-string (type Error)

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My Lets Encrypt certificates were failing to renew while issuing the following command:

/usr/bin/certbot renew

I received the following error:

produced an unexpected error: __str__ returned non-string (type Error). Skipping. All renewal attempts failed.

I found the solution here:

yum -y install ca-certificates

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