I found a similar error
if you look at the tutorial in the iphone portal @ apple
go to distribution
Building your Application with Xcode for Distribution
step 3
Open the Xcode project and Duplicate the “Release” configuration in
the Configurations pane of the project's Info panel. Rename this new
configuration
what I did was
delete both configurations release and distribution
then I duplicated the original debug configuration in release and then
in distribution
For me worked
let me know