Simple android application from scratch tutorial won't build; missing dx.jar

I'm running IntelliJ IDEA 11.1.1 on MacOS 10.5.8.
I'm new to IntelliJ, trying to build the very basic "Simple Android Application from Scratch" tutorial at
http://wiki.jetbrains.net/intellij/Simple_Android_application_from_scratch_in_IntelliJ_IDEA_10.5

My computer has Android SDK 2.1 installed, which I specify for my project. However when I try to build I get this error:

     File /Users/oreilly/android-sdk-mac_86/platforms/android-2.1/tools/lib/dx.jar doesnt exist

Indeed, checking my android-sdk directory that dx.jar file does not exist. I have several SDK versions installed, and dx.jar does not appear in Android SDK 2.1 and above.
I had installed the SDKs with the SDK Manager, so I don't understand why dx.jar is missing for later SDK versions.
Can anyone help?

Thanks,
Tom

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