Device Page Service Error after updating from 2.8.0 to 2.8.2

Hi all,

today, I updated my demo server ZENworks MDM from the version 2.8.0 to the version 2.8.2. After this update i cannot display users and devices in dashboard. When i click on the Users tab, i`m getting the error: "Device Page Service Error. Unable to complete operation. If this error persists, please contact ZENworks Technical Support." But I`m able to login as user to the self service portal and also i see my user and his device in the Activity Monitor.
Please, how can i solve this issue?

Thanks
Milan