Still no help. So if I understand right I paid EUR 249 for an error message....

This seemed to be a non related Joomla problem. And its solved now.
I now installed Virtuemart en E-ticket, but I get this error: "Fatal error: Class 'JFormRule' not found in /public/sites/www.kartingeefde.nl/administrator/compon...ls/rules/integer.php on line 23".

What is the problem?

I accidentally uploaded E-ticket before I installed Virtuemart, so e-ticket didn't work.
Therefore I tried to uninstall it, but now the hole site is defect. The homepage shows "Error loading Components" and the rest is not working anymore. I can't access the components in the backend anymore.
Please help quickly!