No, this is not an error in WP Publication Archive.
WP Publication Archive hooks on to WordPress' built-in
the_title filter. This filter is defined in
/wp-includes/post-template.php on line 118 and takes in two parameters - the title itself, and the ID of the post.
WP Publication Archive adds a filter to this hook that also accepts two parameters, the title and the ID.
It looks like All in One Event Calendar is also adding a hook to this filter, but they're adding a hook that doesn't take two parameters.
If you want to skip this functionality all together, comment out the line that adds the title filter on line 53 in