Exception during column creation, on sharepoint foundation 2010

Mar 25, 2010 at 10:05 AM

When I try to create a Lookup (query based filtering) column the next exception results after I choose the column to wich perform the query

You are trying to use a SPWeb Object that is closed. and its not valid

Is there a way that can be fixed?

there is also an error when I try to make a parent child relationship and the parent doesn't have a any items. which is a little obvius, but it doesn;t let me insert any item