Fixed getClassesMapping() exception message

Author: MarcinOrlowski

CHANGES.md

@@ -6,6 +6,9 @@ See [compatibility docs](docs/compatibility.md) for details about backward compa
 
 ## CHANGE LOG ##
 
+* dev
+   * Fixed incorrect exception message thrown in case of incomplete `classes` config mapping (@dragonfire1119)
+
 * v3.0.1 (2017-02-23)
    * Updated `composer.json` to list `laravel/framework` among requirements
 

src/ResponseBuilder.php

@@ -59,7 +59,7 @@ protected static function getClassesMapping()
 			foreach ($classes as $class_name => $class_config) {
 				foreach ($mandatory_keys as $key_name) {
 					if (!array_key_exists($key_name, $class_config)) {
-						throw new \RuntimeException('CONFIG: Missing "{$key_name}" for "{$class_name}" mapping');
+						throw new \RuntimeException("CONFIG: Missing '{$key_name}' for '{$class_name}' mapping");
 					}
 				}
 			}