Error can appear while running the 'clashes to issues' or editing attributes from the add-in or the web site.
This message is likely caused by the fact that no main viewpoint is associated to that issue.
To correct this, simply open the 'view/edit' window if you're in the add-in, or click on the 'edit' icon if you're on our web site:
You then have to set the main viewpoint:
Notice that at the top left of the image, a yellow icon will appear indicating that the main viewpoint is set. You should now be able to edit the issue.