Hello all, I'm fairly new to Mac development and iPhone programming. Currently working my way through "Beginning iPhone Development" by Apress. Here's the problem, which I would be very grateful to have some assistance with: I've just upgraded XCode to 3.2.1. My iPhone is on version 3.1.2 (7D11) When I try to build and run a new project I get the following error pop up: I've gone into the project settings and set the Base SDK for all configurations to be "iPhone Device 3.1.2" under General. Under the "Build" tab the iPhone OS Deployment Target is set to iPhone OS 3.1.2. Please could someone nudge me in the right direction of what else needs to be configured? I'm sure it's something simple but I'm at a loss. Thanks very much in advance.