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Editorial Team
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Asked: 2026-05-29T11:21:25+00:00

I’m running the very latest version of xcode (4.2.1). And I’m signed up to

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I’m running the very latest version of xcode (4.2.1). And I’m signed up to the ios developer program.

When I create a new iOS Application for iPhone or iPad, using storyboards or not it doesn’t seem to matter, xcode crashes on me when I try to open the .xib or .storyboard files.

Here is the error provided when I click on the storyboard file before it crashes.

ASSERTION FAILURE in /SourceCache/IDEInterfaceBuilderCocoaTouch/IDEInterfaceBuilderCocoaTouch-933/IB Plugin/Utilities/IBObjectMarshalling.m:179
Details:  Interface Builder encountered an error communicating with the iOS Simulator. "Interface Builder Cocoa Touch Tool" (54332) failed to launch and exited with status (null), signal 10. Please check Console.app for crash reports for "Interface Builder Cocoa Touch Tool" for further information.
Function: NSDistantObject<IBCocoaTouchToolProtocol> *IBAttachToCocoaTouchTool(IBCocoaTouchTargetRuntime *)
Thread:   <NSThread: 0x40010a260>{name = (null), num = 1}

Something to do with the iOS simulator? Exactly the same message appears when I try open an .xib file.

When I try to run or test a project I get an error when it tries to compile the storyboard or xib files. eg

CompileXIB EmptyViewTest/en.lproj/com_markstewart_comViewController.xib
    cd /Users/mark/Sites/_iOS/EmptyViewTest/EmptyViewTest
    setenv IBC_MINIMUM_COMPATIBILITY_VERSION 5.0
    setenv PATH "/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin:/Developer/usr /bin:/usr/bin:/bin:/usr/sbin:/sbin"
    setenv XCODE_DEVELOPER_USR_PATH /Developer/usr/bin/..
    /Developer/usr/bin/ibtool --errors --warnings --notices --output-format human-readable-text --compile /Users/mark/Library/Developer/Xcode/DerivedData/EmptyViewTest-dxxqhrayajehooezj flgyjqysqkp/Build/Products/Debug-iphonesimulator/EmptyViewTest.app/en.lproj/com_ markstewart_comViewController.nib /Users/mark/Sites/_iOS/EmptyViewTest/EmptyViewTest/EmptyViewTest/en.lproj/com_m arkstewart_comViewController.xib --sdk /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator5.0 .sdk

Please help! How do I get this to work again?

I’ve since totally uninstalled and re-installed developer tools. Same problem still occurs. It seems to be something to do with the iphone simulator as when I try to run the simulator app by itself it instantly crashes too. (see attached screenshot). What is going on?! 🙁

ios simulator crashing too

—– UPDATE 2

Still having this problem! I can sometimes build applications, but as soon as I click on either the .xib or .storyboard file (in separate projects) xcode crashes. When they do succeed I get the error above that the simulator has issues locating the SDK.

I’ve uninstalled and reinstalled xcode about five times now and the same issues keeps occurring.

Here is the crash report from the “Interface Builder Cocoa Touch Tool” error. If it makes sense to anyone? Crash Report

Does anyone have any other ideas? Starting to get pretty desperate.

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1 Answer

  1. Editorial Team

    did you installed TotalFinder?

    I had the same problem caused by TotalFinder’s Asepsis feature.

    Asepsis current Version (1.1) Conflicts with Xcode 4.2 and Glims (see image).
    enter image description here

    The Website lists this known issue:

    Xcode 4.2, iOS 5.0 Simulator

    Some developers reported that Asepsis breaks iOS 5.0 Simulator and
    causes Xcode 4.2 fail in loading XIB files

    to uninstall just run this command from Terminal:

    sudo open /System/Library/Extensions/Asepsis.kext/Contents/Resources/Asepsis\ Uninstaller.app
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