Why do I receive the notification You are out of space?

Please check the image below. If your account has exceeded  the parameters than you need to clean what you might not need anymore. Or you can upgrade your plan, you can see different options on this link.

@mtij: lumiardan is correct. But you have another thread for the same matter. My colleague is currently on it to give you additional details of the message. Here's the link to the other thread; https://www.jotform.com/answers/1280965. 

Thank you so much!