title: App built with Xcode 4.2 ios 5.0 crashing when installed on iphone with ios 4.3.5
body: <p>I have an app that will not build anymore on ios 4.x</p>
  
  <p>Last week it worked fine, and now I can confirm 2 people with older ios' are unable to launch the app on Test Flight.</p>
  
  <p>1 person (ios 4.3.x) is unable to build the app anymore in Xcode and the debugger output is as follows</p>
  
  <pre><code>warning: Unable to read symbols from "dyld" (prefix __dyld_) (not yet
  mapped into memory).
  warning: Unable to read symbols for
  /Developer/Platforms/iPhoneOS.platform/DeviceSupport/4.3
  (8F190)/Symbols/System/Library/Frameworks/UIKit.framework/UIKit (file
  not found).
  warning: Unable to read symbols from "UIKit" (not yet mapped into memory).
  warning: Unable to read symbols from "Foundation" (not yet mapped into memory).
  warning: Unable to read symbols for
  /Developer/Platforms/iPhoneOS.platform/DeviceSupport/4.3
  (8F190)/Symbols/System/Library/Frameworks/CoreGraphics.framework/CoreGraphics
  (file not found).
  warning: Unable to read symbols from "CoreGraphics" (not yet mapped
  into memory).
  warning: Unable to read symbols from "libSystem.B.dylib" (not yet
  mapped into memory).
  warning: Unable to read symbols from "libgcc_s.1.dylib" (not yet
  mapped into memory).
  </code></pre>
  
  <p>I am at a loss to figure this one out.  I have been developing with the Latest SDK option and target set to 4.0.</p>
  
  <p>The only change I made (that I can think of) was adding a breakpoint for all exceptions.
  I am removing that and seeing if that makes a difference, but won't get feedback for a while.  I am asking here in case that is not the solution and to see if someone can ease my stress</p>
  
  <p>EDIT
  The breakpoint had no effect.  I didn't think it would affect running with test-flight, but I really hoped it would be the solution.  I am leaving it up here, because it is how I get the debugger to stop before main.m in Xcode 4.2 and want others to be able to set the breakpoint if they didn't know how.
  <img src="https://i.stack.imgur.com/NeY5r.png" alt="how I set the breakpoint"></p>