Getting an Error message when clicking on my form

When some users ( not all ) click on my jotform, they are getting an error message and it will not load. I've attached a screenshot. Other users, are able to open it fine. The name of my form is Group Information Form. I've attached a link to it. Please advise. We use this every day. It has been working fine for a long time, and not i'm having issues with it. 

https://form.jotform.com/71345024678155

Upon checking, I can verify that your form is working properly. I have tried it with Google Chrome and Mozilla Firefox. Here's a screenshot:

I have cleared your form cache so that your forms will be refreshed from our server.

If you are still experiencing the problem, please let us know. Thank you.