I get the following error in High Sierra

[charliejin]

==> Tapping cuber/jsoncpp
Cloning into '/usr/local/Homebrew/Library/Taps/cuber/homebrew-jsoncpp'...
remote: Counting objects: 4, done.
remote: Compressing objects: 100% (4/4), done.
remote: Total 4 (delta 0), reused 4 (delta 0), pack-reused 0
Unpacking objects: 100% (4/4), done.
Error: Invalid formula: /usr/local/Homebrew/Library/Taps/cuber/homebrew-jsoncpp/jsoncpp.rb
undefined method `sha1' for #Class:0x007f9224b924a0
Error: Cannot tap cuber/jsoncpp: invalid syntax in tap!
Charlies-MacBook-Pro-2:json charliebrown$ sudo !!
sudo brew tap cuber/homebrew-jsoncpp
Password:
Error: Running Homebrew as root is extremely dangerous and no longer supported.
As Homebrew does not drop privileges on installation you would be giving all
build scripts full access to your system.