Drest\DrestException::invalidNamedRouteSyntax PHP Method

    public static function invalidNamedRouteSyntax()
    {
        return new self('Invalid named route syntax. ' . 'Must use a formatted string of: {EntityClassName}::{RouteName}. Eg "Entities\\User::get_users"');
    }

 /**
  * Check the format of the named route
  * @param $namedRoute
  * @throws DrestException
  */
 protected function checkNamedRoute($namedRoute)
 {
     if (substr_count($namedRoute, '::') !== 1) {
         throw DrestException::invalidNamedRouteSyntax();
     }
     if (sizeof(explode('::', $namedRoute)) !== 2) {
         throw DrestException::invalidNamedRouteSyntax();
     }
 }