service - Registering Silex Providers Throwing Errors -

creating app in silex , trying take first few steps, 1 of setting services/providers.

i loading these using yaml file. have tried registering each individual docs e.g.

$this->register( new twigserviceprovider(),array() ); 

here current bootstrap file(loading services file):

<?php namespace app;  use igorw\silex\configserviceprovider; use silex\application silex; use symfony\component\routing\route; use symfony\component\routing\routecollection; use symfony\component\httpfoundation\request;   class bootstrap extends silex {     public function __construct()     {         $this['debug'] = true;          $this->registerdefaultparameters();         $this->registerdefaultservices();         $this->registerroutes();      }      protected function registerdefaultparameters()     {         $paths = isset($this['base_path']) ? $this['base_path'] : array();          if (!isset($paths['base'])) {             $paths['base'] = realpath(__dir__ . '/../');         }          $defaults = array(             'config' => $paths['base'] . '/app/config',             'twig.path' => $paths['base'] . '/public/themes/base/templates'         );          foreach ($defaults $key => $value) {             if (!isset($paths[$key])) {                 $paths[$key] = $value;             }         }          $this['paths'] = $paths;     }      protected function registerdefaultservices()     {         $this->register( new configserviceprovider($this['paths']['config'] . "/services.yml") );          foreach($this['services'] $servicename => $servicedata)         {             $this->register( new $servicedata['class'],(array_key_exists('parameters',$servicedata)) ? $servicedata['parameters'] : array() );         }      }      protected function registerroutes()     {         $this->register( new configserviceprovider($this['paths']['config'] . "/routes.yml") );          $collection = new routecollection();         foreach($this['routes'] $key => $value)         {             $collection->add( $key, new route(                 $value['path'],                 $value['defaults'],                 array(),                 array(),                 null,                 null,                 $value['methods']             ));         }          $this['routes'] = $collection;     } } 

my issue is:

with every provider receiving fatal errors like

fatal error: uncaught exception 'invalidargumentexception' message 'identifier "this_is_an_identifier" not defined.'

i'm receiving errors loading services file , manually. , different each provider e.g.

the error related twig provider is:

fatal error: uncaught exception 'invalidargumentexception' message 'identifier "request_error" not defined.'

another 1 relating monolog :

fatal error: uncaught exception 'invalidargumentexception' message 'identifier "dispatcher" not defined.

so every provider/service has wrong isn't case. question why continuously receiving these errors? can see im not doing wrong?

heres composer file in case it's version thing:

    {     "name": "cranbri/cvcms",     "description": "cranbri cv cms silex",     "minimum-stability": "dev",     "require": {         "silex/silex": "1.2.2",         "symfony/yaml": "2.6.1",         "igorw/config-service-provider": "1.2.2"     },     "autoload": {         "psr-4":{             "app\\": "app/"         }     } } 

this stopping development altogether if can give me details appreciated. cheers

i wasn't calling parent!!! therefore have none of values parent class did hence why many of $app variables not set , couldn't found