It's more likely a problem with your desktop system than with the appliance (the good news?) - what language setting do you have? Have you changed your date formatting on your system to something different than your language settings normally have?
I do not know if this helps anybody after all this time, but I have had the same
problem/error with my SW LEM Reports Console, ver 6.6.0. You have to have the
same format for date on the LEM appliance and on your desktop from where you
try to run the Reports. For me, the appliance have MM-Day configuration and my
desktop Day-MM. As soon as I changed it on my desktop, that error disappeared. Unfortunately,
now, I have another error, “Logon error”.