Getting a big yellow box error

Hi,

What is this and how do i fix it:

Notice: Undefined index: img_id in /home/mokoutan/rachaelandpenny.com/piwik/lang/nb.php on line 1

Backtrace -->
#0 Piwik_ErrorHandler(…) called at [/home/mokoutan/rachaelandpenny.com/piwik/lang/nb.php:1]#1 require(…) called at [/home/mokoutan/rachaelandpenny.com/piwik/plugins/LanguagesManager/API.php:129]#2 Piwik_LanguagesManager_API->getAvailableLanguageNames(…) called at [/home/mokoutan/rachaelandpenny.com/piwik/plugins/LanguagesManager/LanguagesManager.php:70]#3 Piwik_LanguagesManager->showLanguagesSelector(…) called at [:]#4 call_user_func_array(…) called at [/home/mokoutan/rachaelandpenny.com/piwik/libs/Event/Dispatcher.php:284]#5 Event_Dispatcher->postNotification(…) called at [/home/mokoutan/rachaelandpenny.com/piwik/core/PluginsManager.php:633]#6 Piwik_PostEvent(…) called at [/home/mokoutan/rachaelandpenny.com/piwik/core/Menu/Top.php:62]#7 Piwik_Menu_Top->get(…) called at [/home/mokoutan/rachaelandpenny.com/piwik/core/Menu/Top.php:75]#8 Piwik_GetTopMenu(…) called at [/home/mokoutan/rachaelandpenny.com/piwik/core/Controller.php:487]#9 Piwik_Controller->setBasicVariablesView(…) called at [/home/mokoutan/rachaelandpenny.com/piwik/plugins/Login/Controller.php:96]#10 Piwik_Login_Controller->configureView(…) called at [/home/mokoutan/rachaelandpenny.com/piwik/plugins/Login/Controller.php:85]#11 Piwik_Login_Controller->login(…) called at [/home/mokoutan/rachaelandpenny.com/piwik/plugins/Login/Controller.php:46]#12 Piwik_Login_Controller->index(…) called at [:]#13 call_user_func_array(…) called at [/home/mokoutan/rachaelandpenny.com/piwik/core/FrontController.php:138]#14 Piwik_FrontController->dispatch(…) called at [/home/mokoutan/rachaelandpenny.com/piwik/core/Controller.php:659]#15 Piwik_Controller->redirectToIndex(…) called at [/home/mokoutan/rachaelandpenny.com/piwik/plugins/CoreHome/Controller.php:42]#16 Piwik_CoreHome_Controller->redirectToCoreHomeIndex(…) called at [:]#17 call_user_func_array(…) called at [/home/mokoutan/rachaelandpenny.com/piwik/core/FrontController.php:138]#18 Piwik_FrontController->dispatch(…) called at [/home/mokoutan/rachaelandpenny.com/piwik/index.php:53]

I updated and it went away. Nevermind