Vantage 8.03 start problem

Hello all,
I have question:
We have test machine with vantage version 8.03.
We I try login to vantage I have waring:

Error Detail

============

Specified argument was out of the range of valid values.

Parameter name: index





Stack Trace

===========

at System.Windows.Forms.TreeNodeCollection.get_Item(Int32 index)

at Epicor.Mfg.UI.MenuForm.loadMenu(Boolean getFromDB)

at Epicor.Mfg.UI.MenuForm.loadProductSettings()

at Epicor.Mfg.UI.MenuForm.loadCompanySettings(String companyID)

at Epicor.Mfg.UI.MenuForm.loadUserSettings(String userID)

at Epicor.Mfg.UI.MenuForm.setupDefaults()

at Epicor.Mfg.UI.MenuForm.ShowDialog(String[] args)

Maybe somebody knows what is going on.
thx for help
henry