Could you try to make the titles more explicit please. A good title will help others identify what are you talking about quickly.
And also explain after what actions or what you did before this happened so that I can reproduce the error.
Thank you for the report and for the screenshot. I will investigate this issue and fix it for the next update.
 It looks like you deactivated the waypoint module (unless I'm wrong) which causes this error. If you reactivate it (in the 'Project' tab) the error will disappear. I will make a fix for this module.