What does this error message mean?

I was sending an email,& istarted to compose another to someone else,when a window poppedup that said this:An error has occured in the script on this page.
line:5
char:1
Error:the remote server machine does not exist or is unavailible
Code:0
URl:http://bis2ds.180solutions.com/ads.aspx?did=900&ver=4.2fbid=0&duid=tucdvhetvqpbzamuimxpjkdrl&
Do you want to keep running scripts on this page?
I’m still kind of new to all this stuff ,but what is all that about? thank you very much for your help!