That does not mean the resolution should be predictable. The resolution should not rely on divine intervention, the wise third party who sets everyone straight, or the clock striking midnight. The conflict must be resolved by a change that occurs in each character that sets them on the path of mutual love and cooperation. Think of it like focusing a camera; the characters are muddled, and must reach clarity in order to reach their happily ever after. For example, Hank and Greta realize that their goals are not mutually exclusive—they can join forces, and reach their goals together.
What does internal conflict within groups look like? The conflict would not necessarily be a group conflict but rather a conflict within yourself that impacts the group or that might cause a dilemma for you. For example, if you worked in a marketing department, and the majority vote on a new marketing slogan was not what you agreed with and offended you personally, this would create an internal conflict within the group. Do you say something or defend your position? Or do you just leave the issue alone? What if others later find a problem with the slogan, too?