Leaking K-H brake line?

Installing my new K-H setup on my dart. I bought new crossover lines for the calipers. Fluid is leaking where the rubber line meets the caliper line for some reason. took it back apart and dont see anything wrong, put back together and still sits there and drips..Anyone ever had this happpen and what was the problem? It didnt leak when i had the drum brakes on 3 weeks ago..