Directional Light creates wierd shadow?

So i have a directional light that i want to use as my sun to create shadows on a map that is very large. But i get the following lines on my meshes?


Can someone explain how to get this fixed?

Looks like aliasing from your texture map. If you want high-fidelity shadows, I’d suggest setting them to “soft” and using a higher resolution.

I figured it out by setting the “bias” to 0.05

Its kind of a hack method, however it works.