This generally means that another instance of this process was already running or is hung in the debugger

More errors when downloading onto the device.  This error can be cleared by applying the 1st rule of computing to Xcode & the device.

The Potala, Lhasa, Tibet

More great spherical panoramas from 360Cities;


the Potala Palace (budalagong) in tibet

Facebook connect

Here's a tutorial for what we're talkin' about;
http://vimeo.com/3616452

Hopefully that's it?

Codesign error

The following error appeared after working on my provisioning profile;
CodeSign error: Certificate identity 'iPhone Developer: CHRIS LAMB (W8LV24J2J6)' appears more than once in the keychain. The codesign tool requires there only be one.

Need to go back into Applications - Utilities - Keychain Access and delete the extra certificate in the Keychain program.

Provisioning Profiles

What they are and why - a direct Apple quote ;
A provisioning profile is a collection of digital entities that uniquely ties developers and devices to an authorized iPhone Development Team and enables a device to be used for testing. A Development Provisioning Profile must be installed on each device on which you wish to run your application code. Each Development Provisioning Profile will contain a set of iPhone Development Certificates, Unique Device Identifiers and an App ID. Devices specified within the provisioning profile can be used for testing only by those individuals whose iPhone Development Certificates are included in the profile. A single device can contain multiple provisioning profiles.
 
Simply though:
Check for the status on both your device (iPhone/iPad) and within Xcode