Native Extension: Invalid extension descriptor: myExtension.ane

Invalid extension descriptor: myExtension.ane

Trying to build an ane with adl and getting this error. Not sure what it means. Everything looks right to me...

adt -package  -keystore ~/testcert.p12 -storepass xxxxx -storetype PKCS12 -tsa -target ane myExtension.ane extension.xml -swc com.myextension.air.swc           -platform MacOS-x86 -C platform/mac .

extension.xml:

<extension xmlns="http://ns.adobe.com/air/extension/3.1">

    <id>com.myextension.air</id>

    <versionNumber>1.0.0</versionNumber>

    <platforms>

      <platform name="MacOS-x86">

        <applicationDeployment>

          <nativeLibrary>MyFrameworkOSX.framework</nativeLibrary>

          <initializer>NativeExtensionsInitializer</initializer>

          <finalizer>NativeExtensionsFinalizer</finalizer>

        </applicationDeployment>

      </platform>

      <platform name="default">

            <applicationDeployment/>

        </platform>

    </platforms>

</extension>

Anyone notice what I'm missing here?

Thanks