trouble with material

Development Rendering
1

My homemade material has a problem

see image: https://goo.gl/photos/W9xqP8xqHXNRQ8Y57

This black line
how can i fix it?

thanks

2

Are you sure the lines aren’t on the texture itself? have you checked it’s borders?
Also try selecting the directional light and set it to Movable see if the lines disappear.