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Editorial Team
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Editorial Team
Asked: May 14, 20262026-05-14T01:03:54+00:00 2026-05-14T01:03:54+00:00

[edit] Found the solution. Reinstall EVERYTHING – xcode, mono, monodevelop and monotouch. Now it

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[edit]

Found the solution. Reinstall EVERYTHING – xcode, mono, monodevelop and monotouch. Now it works. yay.

[/edit]

I’ve had Xcode (3.2.1 – SnowLeopard, iphone 3.1.3) installed for a while, and I can run and build apps on it fine.

I installed MonoTouch, as I want to leverage the 8+ years of .NET skills I have 🙂

So I installed:

  • Mono: MonoFramework-2.6.1_1.macos10.novell.x86

  • MonoTouch: monotouch-eval-1.5.0

  • MonoDevelop: MonoDevelop-2.2.1-r152508 (was 2.2.1,
    but when I started it up, it said
    there was an update, which I installed – thats the update version)

If I make a new project and build it, I get any of the following errors:

  • Build failed. Object reference not
    set to the instance of an object.
  • Build failed: ibtool not found (btw,
    it’s in /Developer/usr/bin/ibtool) or
    a similar one to the second one if I
    use the older (2.2.1 released)
    version of MonoTouch.

I can’t find any debug info anywhere. I could reinstall XCode/iPhone SDK, but as it already is installed and works (and no, this isn’t a SL upgrade), it doesn’t make sense.

Anyone got any ideas? I SO want to use MonoTouch – Obj-C drives me up the wall! Console apps (mono ones) work fine.

Mac OS X 10.6.2, Macbook Pro, clean install with old settings moved over.

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  1. Editorial Team
    Editorial Team
    2026-05-14T01:03:54+00:00Added an answer on May 14, 2026 at 1:03 am

    Posting to make the answer to the question more obvious on the list, the solution was:

    The “ibtool” not found means that MonoTouch/MonoDevelop can not find your XCode installation. Chances are, you did not install the XCode SDK. Sometimes upgrades break Apple’s SDK, so you need to reinstall Apple’s SDK.

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