This error occurs if you are on the Free Plan. This plan allows you to set schedules for up to two integrations for a period of 30 days. After 30 days, the schedule is automatically turned off. You can reactivate the schedule for another 30 days if needed.
If you want your schedules to run continuously without turning off every 30 days, we recommend considering an upgrade to one of the higher-tier plans, such as the Basic plan or higher. You can find more details about the plans here: