Dovecot: Failed to initialize SSL server context

Operating system: Ubuntu Linux 20.04.2
Webmin: 1.973
Virtualmin: 6.16

I am getting the following error when trying to access the email server using any email client.

dovecot: imap-login: Error: Failed to initialize SSL server context: Can’t load DH parameters: error:1408518A:SSL routines:ssl3_ctx_ctrl:dh key too small: user=<>, rip=x.x.x.x, lip=x.x.x.x, session=<fhrknuC/m+lJ56E2>

Thanks for any help!

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