Parts of image are totally black

I’m doing text animation and for some reason there is always some parts in the text that are totally black, even if I put lamp right next to it. I have used just environment lightning and if I rotate camera different parts become black. Here is two images to show my problem.

https://www.dropbox.com/sh/ivhp51zth3j1q1j/AACGXQDWDkM7WwCCIWzuvNvja?dl=0

A post like that won’t reveive much answers, you’re just reporting you have a problem without providing any information of the setup.