Symptom

The client gets an exception similar to:

ReplyError: ERR max requests limit exceeded. 

Diagnosis

Your database exceeds the max monthly request count limit.

Solution-1

You can refactor your application to send less number of commands.

Solution-2

You can upgrade your database to a paid plan, such as pay-as-you-go or a fixed plan by entering a payment method. When you entered your credit card, your database will be upgraded automatically.

See here for more information.