Weird Screen on Internet Explorer

[Sadie]

I need some help please. This is happening on both my desktop and laptop. I was logging in to my employers website and was entering a date and time on a calander and when I hit the submit button I get a screen that is a Windows Internet Explorer screen. Inside it says " Object reference not set to an instance of an object." What is that and most important how do I fix it? And as I said it does this on both my computers.

Thanks in advance

[Broni]

It's most likely web site fault.
Try Firefox, and see, if same thing happens.

[Sadie]

I put Firefox on the Laptop. Same thing

[Broni]

Contact your employer, and ask them about the error.