First attempt at running Visual Studio project fails

So I am completely new to PHP. Thought I would try to work through some tutorials. I bought the Devsense Visual Studio add in, created a project using the PHP project scaffolding, and attempted to run.
The results was the following exception:
require_once(): Failed opening required 'C:\Users\jas\Source\Repos\PHPWebProject\PHPWebProject/vendor/autoload.php' (include_path='.;C:\php\pear')
Any ideas?
The results was the following exception:
require_once(): Failed opening required 'C:\Users\jas\Source\Repos\PHPWebProject\PHPWebProject/vendor/autoload.php' (include_path='.;C:\php\pear')
Any ideas?