"rails new [Blah]" No such file

So I'm new to Ruby and also to Rails. I have recently installed Ruby on Arch Linux. It was mostly all fine any happy except for a few errors here and there but now when I try initializing a new rails app using rails new AppName I get the error

bash: /home/[username]/.gem/ruby/2.3.0/bin/rails: No such file or directory

I've tried creating a file and directory called rails in but get more errors.

reinstalling rails same outcome

reinstalling ruby same outcome

following any other dependencies at install also leads no wear.

Ask for any info you may need. Thanks in advance