E2130 - ECE_DataHandlerInUse

When your schedules are running, the below error message can be displayed in the Logs:
 
E2130 - ECE_DataHandlerInUse: The requested cached DataHandler is currently in use. This can happen if you are trying to run a transfer and another transfer is currently running and using this DataHandler. If so, please wait till the other transfer has finished and try again.

This can happen when you are trying to run a schedule or a transfer but there is a different schedule already running at the same time. You wait for the schedule to finish running and then run your transfers or schedules separately. Please check the Schedules and their next time to run so you can avoid this error.