Error code: 0x0

I updated last week my lab at home : * XenServer 6.0 to XenServer 6.0.2 * Provisioning Services 6.0 to Provisioning Services 6.1 * and XenDesktop 5.5 to XenDesktop 5.6 Everything went well for XenDesktop, update was smooth and VDA update was successful and simple as well.