title: iPhone: Application Install Fails With "Invalid Signer" Error
body: <p>The iPhone is attached to a Mac runnning the latest iTunes version and I am 100% sure that her UDID is in the provisioning file.  Her iPhone has not been jailbroken and we even restored it to factory settings.</p>
  
  <p>I am having trouble installing our development build on this one iPhone.  The error is:</p>
  
  <blockquote>
    <p>the application "[Application Name]" was not
    installed on the iPhone "iPhone"
    because the signer is not valid</p>
  </blockquote>
  
  <p>I am 100% sure that the UDID is accurately entered in the provisioning file and that they correctly copied the right provision file/build combo.  This same combo has been successfully installed on over a dozen iphones.</p>
  
  <p>We have been able to install this on some devices with no problems.</p>
  
  <p>Edit:</p>
  
  <p>From comments to an answer:</p>
  
  <blockquote>
    <p>We can install it on 100 iphone with
    our account. We have about 40 iphones
    in this provisioning profile and it
    works on 38 of them. </p>
  </blockquote>