Update Criterion.php

app/models/Criterion.php

 	//     protected $table = 'new_criteria';
 	protected $table = 'criteria';
 
-	public function outcomes($criterion_id)
+	public static function outcomes($criterion_id)
 	{
 		//	    return $this->belongs('Objective')->belongs('Outcome');
 		//	    TODO: Changes here
 		}
 		return $students_achieved;
 	}
-}
+}