Hello,
I just installed the new K2 on my website. Havn't used K2 before on that site.
Nevertheless, after the installation the complete site was down and not available anymore. I cannot access the administrator panel or the site at all.
I get the HTTP 500 Error. This is a disaster.
Have done a backup via Akeeba before I did the installation.
But cannot access it, of course, because I have the HTTP 500 error also when trying to access the administrator login.

Anyone any idea how to resolve this???

what says error.log?

Thanks for taking care of this issue:
This is the error code I foudn with the help of the hosting company.

PHP Fatal error: Cannot make static method JModel::addIncludePath() non static in class K2Model in /home2/globamw3/public_html/administrator/components/com_k2/models/model.php on line 40

do you use joomla 1.7? if so, its unsupported from K2

Import your backup via phpmyadmin