I had some issues updating Piwik from version 2.4.1 to 2.5. After the auto update the Piwik worked fine but crashed one day later. It didn’t show anything when accessing it. Also all requests to the tracking URL where answered with and 500 server error.
I managed to get it working again by downgrading to 2.4.1 and then manually installing the 2.5. version. Now everything seems to work again except the custom variable page under the customer section. When I open the page following error message is shown.
Oops… there was a problem during the request. Maybe the server had a temporary issue, or maybe you requested a report with too much data. Please try again. If this error occurs repeatedly please contact your Piwik administrator for assistance.
Any ideas what’t going wrong here?