Avast says infection error.prv.pl what is this ?

I’ll be on a web page and a banner will popup saying infection found error.prv.pl, what does this mean ? I have not been to any site with that url.

http://sitecheck.sucuri.net/results/error.prv.pl
http://zulu.zscaler.com/submission/show/b346995c71100a3c6cfe8d47384fedde-1359993791

Could be the case another site is redirecting to that URL, or a frame in a page that uses content from that URL.

Probably, but as avast! blocked it, there shouldn’t be a problem.