cingular 8125 w/ wm5

unexpected error

Method not found: set_format
System.windows.forms.datagridtextboxcolumn

select details
Missing methodexception
Method not found: set_format
System.windows.forms.datagridtextboxcolumn.
atCSPocketTerra.BCNavMain..ctor()
at CSPocketTerra.BCNavMain.Main()

select quit
unexpected error
select details
NullReferenceException
at CSPocketTerra.BCNavMain.Dispose()
at System.ComponentModel.Component.Finalize()

Any help would be greatly appreciated as I am trying to get my PPC set up to geocahing with my son.