Do you ever get this screen in GbG?
You should only be getting this message when you click on an adjoining sector that your guild does not own. What Inno has done is inserted this message between waves of a two wave fight in an attempt to thwart people who are using a bot/script/auto clicker or the like.
They have already included pop-ups post-fight to make it impossible to predict the number of times we need to hit the ESC key before pressing A to attack, R to replenish troops and B, B, B, B to get through all the spam windows to finish the fight.
Inno released a statement found here about what they're changing or not changing in GbG.
Maybe they should remove the anti-cheat so non-cheaters don't have to deal with pop-ups because who doesn't love pop-ups?