No problem! It’s defintiely not the best solution, but it gets the job done until the plugin’s author updates the plugin to fix this issue.
I only use the free features so just being able to use the plugin is a whole lot better than having my newsletter stall while I wait for a fix. Plus, I didn’t have to uninstall and lose all my newsletters and lists.
I had this same problem. You can comment out line 30 and it will activate, but then you will need to grant the permissions manually per role. I use the Members plugin (https://themehybrid.com/plugins/members) so I was able to easily grant the permissions there.