Shadow gap problem

Hello,
I’ve problem with shadows from point light in Unity 5.1.3. There is a gap between wall and shadow casted by it. I checked, there aren’t any gaps beetwen walls. You can see it on screenshot I attached to this question. I also tried setting shadow bias to zero or setting Cast Shadow propery in caster object to Two Sided, but nothing helped. Is there a way to solve this problem?

Try increasing “Normal Bias” to some higher value (near around 2.0 or something in my case) & see if that can solve it. Or use “Two Sided” shadows in Renderer object