I have a form that sends to an email. I have used composer to install sendgrid and things used to work when I originally set it up.

It's now some time later and my dev site is getting closer to a production release, so I was retesting the forms and they fail.

I've no doubt changed something in the interim that has broken it, but I'm struggling a bit to figure out what.

The error is:

Fatal error: Class 'Unirest' not found in /home/ubuntu/workspace/vendor/sendgrid/sendgrid/lib/SendGrid/Web.php on line 20

My composer.json is:

{
	"name": "silverstripe/installer",
	"description": "The SilverStripe Framework Installer",
	"require": {
		"php": ">=5.3.3",
		"silverstripe/cms": "3.2.0",
		"silverstripe/framework": "3.2.0",
		"silverstripe/reports": "3.2.0",
		"silverstripe/siteconfig": "3.2.0",
		"silverstripe-themes/simple": "3.1.*",
		"frankmullenger/gallery": "1.1.x-dev",
		"sendgrid/sendgrid": "1.1.7",
		"mashape/unirest-php": "dev-master",
		"silverstripe/multiform": "*",
		"silverstripe/kickassets": "^3.1",
		"components/font-awesome": "^4.5"
	},
	"require-dev": {
		"phpunit/PHPUnit": "~3.7"
	},
	"config": {
		"process-timeout": 600
	},
	"prefer-stable": true,
	"minimum-stability": "dev"
}

So Sendgrid is clearly being autoloaded, but Unirest isn't for some reason.

If I put some debug code in it confirms that class_exists('SendGrid') returns true but class_exists('Unirest') returns false.

Any ideas on how to troubleshoot?

Thanks