Xcode 4 & three20 & create IPA archive: No such file or directory

In Xcode 3.2.5 I use "Build And Archive" to create an IPA file without any problems. How can I do that in Xcode 4? I think I have to use "Product -> Archive", but I get over 100 error messages in the three20 framework. Most are "No such file or directory". ("Product -> Build For -> Build For Archiving" works. No errors.)In Xcode 3.2.5 I use "Build And Archive" to cre