Having issues making my diagonal lines connect

I'm trying to use http://patternify.com to try to make diagonal lines, it's working but the lines don't seem to be connecting, this is how they show up:

If you look closely you'll see small gaps between where the lines meet.

This is the link to the pattern generator http://ptrn.it/1TonkQe

Any information on how to make these lines connect or a better way to do it would be great thanks