Error after update v2.5.0 Undefined index: enabled in /var/www/clients/client1/web2/web/analytics/core/Development.php (no replies)

After updating the piwik system to v2.5.0 the following error occurred and i have not been able to fix it as of yet. Any ideas?

Notice: Undefined index: enabled in /var/www/clients/client1/web2/web/analytics/core/Development.php on line 34

Backtrace -->

#0 Piwik\Error::errorHandler(...) called at [/var/www/clients/client1/web2/web/analytics/core/Development.php:34]
#1 Piwik\Development::isEnabled(...) called at [/var/www/clients/client1/web2/web/analytics/core/Cache/PersistentCache.php:94]
#2 Piwik\Cache\PersistentCache::populateCache(...) called at [/var/www/clients/client1/web2/web/analytics/core/Cache/PersistentCache.php:49]
#3 Piwik\Cache\PersistentCache->__construct(...) called at [/var/www/clients/client1/web2/web/analytics/core/Plugin.php:141]
#4 Piwik\Plugin->__construct(...) called at [/var/www/clients/client1/web2/web/analytics/core/Plugin/Manager.php:870]
#5 Piwik\Plugin\Manager->makePluginClass(...) called at [/var/www/clients/client1/web2/web/analytics/core/Plugin/Manager.php:836]
#6 Piwik\Plugin\Manager->loadPlugin(...) called at [/var/www/clients/client1/web2/web/analytics/core/Plugin/Manager.php:776]
#7 Piwik\Plugin\Manager->reloadPlugins(...) called at [/var/www/clients/client1/web2/web/analytics/core/Plugin/Manager.php:615]
#8 Piwik\Plugin\Manager->loadPlugins(...) called at [/var/www/clients/client1/web2/web/analytics/core/Plugin/Manager.php:95]
#9 Piwik\Plugin\Manager->loadActivatedPlugins(...) called at [/var/www/clients/client1/web2/web/analytics/core/FrontController.php:323]
#10 Piwik\FrontController->init(...) called at [/var/www/clients/client1/web2/web/analytics/core/dispatch.php:33]
#11 require_once(...) called at [/var/www/clients/client1/web2/web/analytics/index.php:47]

A fatal error occurred

The following error just broke Piwik (v2.5.0):

Undefined class constant 'Piwik\Tracker\GoalManager::TYPE_BUYER_NONE'
in
/var/www/clients/client1/web2/web/analytics/core/Singleton.php line 37