Why I'm getting We cannot complete your request error in Inventory widget?

My form was working great but now all of the inventory widgets display the following message: "We cannot complete your request".

https://form.jotform.com/bofsks/sessions-2017

Please advise.

I checked your Account and it was related to API keys that Inventory widget is using, even though you didn't reach the limit. Anyhow, I reset it for you and it is working now.

If you have any further questions please let us know.

Thank you!