Hi,
I suspect that you use browser that is not internet explorer to open the panel. Is this correct?
If you open it using internet explorer, there shouldn't be any problem.
If you would like to use any others web browser to open it, you might need to do a troubleshooting step in this link below
http://digital.ni.com/public.nsf/allkb/151BE12C055F57CE86257043006CB4B3
Another factor to this issue is that you don't have LabVIEW run-time engine or LabVIEW installed in the computer that you are trying to open it.
Hope this help
Best regards,
TuiTui