This means that there is a problem in your configuration. To find out where the problem is coming from, click on each page of your campaign until you find a box underligned in orange (see below):

In this example, it means that the problem comes from the losing page redirection. To fix it, all I need to do is modify this redirection.

If the problem is corrected, the orange tab disappears.

This means that your module is not up to date. To fix it, click on the module's drop-down menu and click on "update" .

The color may not change immediately when you make your change, but this will not affect your campaign.