PVSS00opc - SYS/WARNING - OPCGroup, groupGA, Could not start Refresh

Enclosed you'll find the explanation for a log-message which can occur during runtime of the OPC-client. The log-messages are written to the PVSS_II.log-file.

PVSS00opc (1), 2012.10.01 15:30:24.582, SYS, WARNING, 54, Unexpected state, OPCGroup, groupGA, Could not start Refresh on Engine_State:Unspecified error (0x80004005)

Log-messages with symbolic names:

PVSS00opc (<driver-number>), <TIMESTAMP>, SYS, WARNING, 54, Unexpected state, OPCGroup, groupGA, Could not start Refresh on <OPC-group>:<OPC-server error code>

The log-message describes that the refresh (general query GQ) for the OPC-group <OPC-group> was not possible.
The given error-code <OPC-server error code> is return by the OPC-server.
To get detailed information about the error code please get in contact with the software vendor for the OPC-server.

Most of the time this error occurs when there is no active item defined in the OPC group or the OPC group only contains output addresses.
Therefore also please check the settings for the OPC-group and OPC-addresses in the WinCC OA system.