@param, @var, @property and @return must declare types as boolean, integer, string, array or null

models/User.php

@@ -76,7 +76,7 @@ class User extends \yii\base\Object implements \yii\web\IdentityInterface
 	 * Validates password
 	 *
 	 * @param string $password password to validate
-	 * @return bool if password provided is valid for current user
+	 * @return boolean if password provided is valid for current user
 	 */
 	public function validatePassword($password)
 	{