Base64 decoding error exim4

If you get the following error when testing TLS.

TLS error on connection from ... (DH params import): Base64 decoding error.

Regenerate your /var/spool/exim4/gnutls-params file. You may have upgraded exim and it can no longer read the file. See:

http://www.mail-archive.com/exim-dev@exim.org/msg01219.html