title: iPhone app signing: A valid signing identity matching this profile could not be found in your keychain
body: <p>I'm pulling my hair out over this. I just downloaded the <code>iPhone 3.0 SDK</code>, but now I can't get my provisioning profiles to work. Here is what I have tried:</p>
  
  <ul>
  <li>Delete all provisioning profiles</li>
  <li>Delete login keychain</li>
  <li>Create new "login" keychain, make it
  default</li>
  <li>Create a new certificate signing request</li>
  <li>Create new developer and distribution
  certificates in the Apple developer center</li>
  <li>Download and install them</li>
  <li>Download the WWDR certificate and install it</li>
  <li>Create a new provisioning profile and
  double click it to install</li>
  </ul>
  
  <p>All the certificates report as valid, but <code>Xcode</code> still won't recognize them. What should I try next?</p>
  
  <p>Edit:</p>
  
  <p>I completely re-installed <code>Mac OS X</code> and from a fresh install installed the <code>3.0 SDK</code> and still have the same problem.</p>