Weird Lighting issue

Alright guys so i just got UE4, and im going to be making an android game, i have started doing the blockouts for a level (ignore how low quality it looks atm lol) but anyways, i imported the model, added some lighting and this is the issue i get .Any idea why? Where the black lines are i made sure all vertex’s are merged and everything. So im sort of lost lol.



Look this theme. I think this help you.

Thanks bro!

Dirten, I found this website great at helping with problems like that also Yes its tutorials for UDK but the same practices work in UE4 as well.

Thanks a ton seandennis! This looks to cover my issue!