I have not changed everything and suddenly this message came up plus the following lines:
#0 Piwik_ErrorHandler(2048, Declaration of Piwik_Log_APICall::log() should be compatible with that of Piwik_Log::log(), /homepages/32/d233076604/htdocs/piwik/modules/Log/APICall.php, 52, Array ()) called at [/homepages/32/d233076604/htdocs/piwik/modules/Piwik.php:873]
#1 Piwik::createLogObject() called at [/homepages/32/d233076604/htdocs/piwik/modules/Piwik.php:873]
#2 Piwik::createLogObject() called at [/homepages/32/d233076604/htdocs/piwik/modules/FrontController.php:311]
#3 Piwik_FrontController->init() called at [/homepages/32/d233076604/htdocs/piwik/index.php:54]
What coud be the problem. Now, I tried an update but no positive results. Please help. Thanks.
Your server was probably updated to php 5.2.10.
Please update to Piwik 0.4.1.