is there a pad on the board for the component lead? if you got the schematic and the footprints right, there should be a pad for it. if it's not connecting that particular wire, then you have an unroutable pad, that's because the autorouter can't find a way to get there. it's kind of like the old "3 houses and 3 utilities" puzzle where you end up not able to connect one of the utilities to the last house, because you've blocked the path with another line somewhere else. sometimes moving parts around can open up connections between zones that were previously blocked. sometimes, depending on the DRC rules, you can open up blocked zones by changing wire widths, pad diameters and pad clearances.