Receiving 500error in articles and k2

Hi i am receiving a 500error in articles and k2. I have many components installed in my website, i remember that when i installed the quickstart there was not a problem with k2. My site is http://ptyxiaki.stateofart.co/login.html
[edited by moderstor]
the link with the problem is http://ptyxiaki.stateofart.co/dsdsd.html
appreciate your help
Thank you very much

Hi

Please do not share Your access here. It's a public forum.

I've logged to pane, but looks like panel is broken too. I would advice to reinstall joomla as a first step.