VersionNotFoundException

[Shravan]

When I am accessing a column value in a row using
DataRowView["ColumnName"], its throwing
VersionNotFoundException with message "No original data to
access".

The exception occurs in - Paint column of my Custom Combo
Column Style when I access column value using

GetColumnValueAtRow(<CurrencyManager>, <RowNum>), when I
used DataRowView["ColumnName"] instead of that one, it
raises the same above exception.

Anybody, please help.

Thanks,
Shravan.