Coveo reindex error: The parameter 'p_Communication' must not be null

I was getting the following error when try to re-index Coveo in a new environment.
The parameter 'p_Communication' must not be null

This was fixed by setting the Sitecore username/password needed for communication between Coveo and Sitecore. You can do this by going to the Control panel in Sitecore. Under the Coveo search section, click on "Configuration" and then the "Configure" button under the Sitecore Credentials heading.

This is not an issue in a lower environment like your local since Coveo uses the default admin b password to authenticate. But this becomes an issue in any higher environment that doesn't use the default admin password. Hope this helps someone else.

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