i am creating a web page for importing user contacts from yahoo.
i let the user enter his username and password on one page and then
post it to another page by specifying the postbackurl for the button
to next page where i access the username and password from previous
page using the previous page property.
Also i have specified the path of page in
PreviousPageType directive in VirtualPath Property.

sometimes this approach works fine but sometimes the code crashes
saying cannot convert from 'importcontacts_aspx' to
'importcontacts_aspx'

why is this so .

is there any solutions or better approach for this problem?