Basically this is referring to your settings in simulation control. For example, if you have a computing quota of 3000 core-hours, then (Number of computing cores x (maximum runtime (s)/3600)) cannot exceed 3000 otherwise you will receive said notification.
Note: For the free community plan the yearly core hour quota is 3000 core hour. For the professional trial, the quota is 200 core hours
Thus your option is to decrease the number or computing core or reduce the maximum runtime of the simulation.