minSdkVersion Error when uploading APK to Android Market

When I try uploading the APK to the Android Market, I g开发者_StackOverflow社区et this message:

Market requires the minSdkVersion to be set to a positive 32-bit integer in AndroidManifest.xml.

But I have defined android:minSdkVersion in my Manifest...

  <?xml version="1.0" encoding="utf-8"?>
    <manifest xmlns:android="http://schemas.android.com/apk/res/android"
          package="com.mkainc.tabwidget"
          android:versionCode="7"
          android:minSdkVersion="7"
          android:versionName="2.1">

...

Your SDK information needs to be contained in a uses-sdk tag:

<uses-sdk android:minSdkVersion="integer" 
          android:targetSdkVersion="integer"
          android:maxSdkVersion="integer" />

See the documentation for details.