Invalid parameter ensure at redhat.pp:49

I am getting an error:

Error: Invalid parameter ensure at /etc/puppet/modules/nginx/manifests/package/redhat.pp:49 on node mynode

My class definition looks like this:

class { 'nginx' :
    	manage_repo		=> true,
    	package_source	=> 'nginx-stable'
	}

I am pretty new to Puppet and any assistance would be GREATLY appreciated!!

Thank you!
Ken