If while trying to apply your activity plan to the schedule you see this message:
The reason for this can be:
The number of surfers included within the plan
The number of rules created within the plan
The length of time you're trying to apply the plan for
To solve this you can:
Reduce the number of surfers in the plan by splitting your different teams into their own activity plans. Here's a guide on how to do this. By splitting up your teams this should also reduce the number of rules you need have within one plan.
Reduce the length of time you apply the plan. Say if you want to apply the plan for 6 months you can instead apply the plan 3 times at 2 month intervals.