Error when trying to reach index.php (1 reply)

Hi!
I get an Error-message when trying to reach my piwik-installation.
I shortly upgraded to php5.5, because my wp-piwik did not work at all.

The error-message shows the following lines:

Notice: Undefined index: nd92ae4 in /mnt/web1/e3/63/5*********/htdocs/Piwik_02/core/testMinimumPhpVersion.php on line 1

Undefined index: n7f240c 
in '/mnt/web1/e3/63/5*********/htdocs/Piwik_02/core/Menu/Top.php' at the line 1

#0  Piwik_ErrorHandler(...) called at [/mnt/web1/e3/63/5*********/htdocs/Piwik_02/core/Menu/Top.php:1]
#1  require_once(...) called at [/mnt/web1/e3/63/5*********/htdocs/Piwik_02/core/PluginsManager.php:24]
#2  require_once(...) called at [/mnt/web1/e3/63/5*********/htdocs/Piwik_02/core/FrontController.php:18]
#3  require_once(...) called at [/mnt/web1/e3/63/5*********/htdocs/Piwik_02/core/Loader.php:72]
#4  Piwik_Loader::loadClass(...) called at [/mnt/web1/e3/63/5*********/htdocs/Piwik_02/core/Loader.php:109]
#5  Piwik_Loader::autoload(...) called at [:]
#6  spl_autoload_call(...) called at [/mnt/web1/e3/63/5*********/htdocs/Piwik_02/index.php:51]