iPhone Simulator vs iPhone OS testing: file is not of required architecture

i'm working on an iphone app ( sdk 3.1.3 ) and I have added the corelocation and mapkit framework. I used the iphonesimulator package, but added them using 'relative to current sdk'. When I test my app in the iphone simulatore everything works. But when I switch to iphone device 3.1.3 i'm getting 2 warnings and 4 build errors: warnings: `.../corelocation` file is not of required architecture `.../mapkit` file is not of required architecture errors: ``` "_OBJC_CLASS_$_MKReverseGeocoder", referenced from:<br /> __objc_classrefs__DATA@0 in VMLViewController.o<br /> "_OBJC_CLASS_$_MKPinAnnotationView", referenced from:<br /> __objc_classrefs__DATA@0 in VMLViewController.o<br /> "_OBJC_CLASS_$_CLLocationManager", referenced from:<br /> __objc_classrefs__DATA@0 in VMLViewController.o<br /> "_kCLLocationAccuracyBest", referenced from:<br /> _kCLLocationAccuracyBest$non_lazy_ptr in VMLViewController.o<br /> ld: symbol(s) not found<br /> collect2: ld returned 1 exit status<br /> Build failed (4 errors, 2 warnings)<br /> ``` I right-clicked on the mapkit framework package, checked get info and the path is set as: `System/Library/Frameworks/MapKit.framework` I have basic iphone dev knowledge, but i don't know what the problem is... Can anyone help me out? Greets, Thomas