Hi,
When you open a device, CiscoView queries the following system objects: sysObjectID.0 (system.2.0) and sysUpTime.0. If it encounters any error on this query, it throws "Internal Error".
It can be due to bad community string stored in RME or some SNMP views configured on device. This can be confirmed by checking the SNMP trace. So, please send the SNMP trace to ciscoworks@cisco.com. Also, please check if you are able to launch CV directly i.e. without going through RME and try IP address of device instead of hostname.
Thanks,
Ashish Kumar