Saber works on layer space so the layer needs to fill the composition. You can't scale it or mask the layer without revealing edges.
If that does not solve your problem we need workflow details and a screenshot of your timeline showing us the modified properties of all problem layers. Press the 'u' key twice to reveal every property you changed, take a screenshot, and then give us workflow and comp details so we can help solve your problem.
I agree with Rick, looks like your layer is not filling the comp screen, either being too small, or scaled/transformed within your comp. That's assuming you mean the issue where the white glow seems to be cut off.
If you mean the odd yellow dots around the white circle, it may be something else. But as you've shown us nothing about your project, and not really defined which "lines" you mean, its hard to say without guessing.
If you post a better screenshot and a more complete explanation it will be much easier to assist you.