Error loadibng product page

i have propeblem on loading the product page when i click on the product to see the details i see error page :
www.domain.com/product/6-hp-compaq-dc5100mt-pentium4.html on the website, an error has occurred. Maybe they will just wait or is misconfigured.


who can help me to configure this error ?

thanks

Beim Abrufen von domain.ch/shop/product/5-traum-website.html ist auf der Website ein Fehler aufgetreten. Möglicherweise wird sie gerade gewartet oder ist falsch konfiguriert.
Vorschläge:
Laden Sie diese Webseite später erneut.
HTTP-Fehler 500 (Internal Server Error): Beim Versuch des Servers, die Anforderung zu verarbeiten, ist eine unerwartete Bedingung aufgetreten.
English:
When retrieving domain.ch/shop/product/5-traum-website.html on the website, an error has occurred. Maybe they will just wait or is misconfigured.
suggestions:
Download this site again later.
HTTP Error 500 (Internal Server Error) when the server tried to process the request, is an unexpected condition has occurred.

that is the screenshot also when i save product is not accepted the same error i see.

i sent you email This email address is being protected from spambots. You need JavaScript enabled to view it. the screenshot of the configuration product page

do you have sample of that in order to find quickly

i have sent the picture of the product