"An unknown error occurred" when signing into iCloud Drive
I recently installed macOS High Sierra 10.13.3 on my MacBook Pro 2016 (8GB and 2.9 GHz) and now Mail, Messages, and Facetime (what I found so far) can not access my contacts or accounts. In fact when I try to use Facetime or Messages none of my contacts names show up and the same of my history. I attempt to put in my password for all of my internet accounts through System Preferences and it just buffers. When I try to sign into iCloud Drive I get "an unknown error occurred." I have tried numerous times in both areas and get the same results. I know that I am putting in the correct passwords as I have typed them in and even tried to copy paste, but with no success. Any advice?
MacBook Pro, macOS High Sierra (10.13.3)