Android SDK Error: Unable to resolve target 'Google Inc.:Google APIs:X'

I the past I wrote a post on a similar issue, but here goes -
There are few variants of this error message:
Unable to resolve target 'Google Inc.:Google APIs:1'
Unable to resolve target 'Google Inc.:Google APIs:2'
Unable to resolve target 'Google Inc.:Google APIs:3'
Unable to resolve target 'Google Inc.:Google APIs:4'
Unable to resolve target 'Google Inc.:Google APIs:5'
Unable to resolve target 'Google Inc.:Google APIs:6'
Unable to resolve target 'Google Inc.:Google APIs:7'
Unable to resolve target 'Google Inc.:Google APIs:8'
Unable to resolve target 'Google Inc.:Google APIs:9'
Unable to resolve target 'Google Inc.:Google APIs:10'
Unable to resolve target 'Google Inc.:Google APIs:11'
Unable to resolve target 'Google Inc.:Google APIs:12'
Unable to resolve target 'Google Inc.:Google APIs:13'
Unable to resolve target 'Google Inc.:Google APIs:14'
Unable to resolve target 'Google Inc.:Google APIs:15'
Unable to resolve target 'Google Inc.:Google APIs:16'
Unable to resolve target 'Google Inc.:Google APIs:17'
Unable to resolve target 'Google Inc.:Google APIs:18'
Unable to resolve target 'Google Inc.:Google APIs:19'
Unable to resolve target 'Google Inc.:Google APIs:20'
Unable to resolve target 'Google Inc.:Google APIs:21'

Reason: Could not find the proper Google APIs Android SDK version. If the android SDK is installed correctly the problem is that the platform SDK requested by the "AndroidManifest.xml" android:minSdkVersion is not installed. For example:
'Google Inc.:Google APIs:1' - change the Android SDK in the project properties
'Google Inc.:Google APIs:2' - change the Android SDK in the project properties
'Google Inc.:Google APIs:3' - install Google APIs SDK Android 1.5
'Google Inc.:Google APIs:4' - install Google APIs SDK Android 1.6
'Google Inc.:Google APIs:5' - install Google APIs SDK Android 2.0
'Google Inc.:Google APIs:6' - install Google APIs SDK Android 2.0.1
'Google Inc.:Google APIs:7' - install Google APIs SDK Android 2.1
'Google Inc.:Google APIs:8' - install Google APIs SDK Android 2.2
'Google Inc.:Google APIs:9' - install Google APIs SDK Android 2.3
'Google Inc.:Google APIs:10' - install Google APIs SDK Android 2.3.3
'Google Inc.:Google APIs:11' - install Google APIs SDK Android 3.0
'Google Inc.:Google APIs:12' - install Google APIs SDK Android 3.1
'Google Inc.:Google APIs:13' - install Google APIs SDK Android 3.2
'Google Inc.:Google APIs:14' - install Google APIs SDK Android 4.0
'Google Inc.:Google APIs:15' - install Google APIs SDK Android 4.0.3
'Google Inc.:Google APIs:16' - install Google APIs SDK Android 4.1
'Google Inc.:Google APIs:17' - install Google APIs SDK Android 4.2
'Google Inc.:Google APIs:18' - install Google APIs SDK Android 4.3
'Google Inc.:Google APIs:19' - install Google APIs SDK Android 4.4
'Google Inc.:Google APIs:20' - change the Android SDK in the project properties
'Google Inc.:Google APIs:21' - install Google APIs SDK Android 5.0.1

You can do this using the Android SDK Setup utility:
Option 1: Eclipse -
"Windows" -> "Android SDK and AVD Manager" -> "Available packages" -> "Third Party" -> "Google"

Option 2: Command line - start the "SDK Setup" here (x86):
C:\Program Files\Google\Android SDK\SDK Setup.exe
or here (x64)
C:\Program Files (x86)\Google\Android SDK\SDK Setup.exe

getCacheTotalSize causes NullPointerException

After starting to use a new AdMob SDK I noticed the following exception in the Android Market Developer Console:http://www.blogger.com/img/blank.gif
java.lang.NullPointerException
at android.webkit.WebViewDatabase.getCacheTotalSize(WebViewDatabase.java:735)
at android.webkit.CacheManager.trimCacheIfNeeded(CacheManager.java:557)
at android.webkit.WebViewWorker.handleMessage(WebViewWorker.java:195)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:123)
at android.os.HandlerThread.run(HandlerThread.java:60)

I solved it using a suggestion I found online. You can use other ways to disable the ads, depending which SDK you use:

WebViewDatabase webViewDB = WebViewDatabase.getInstance(this);
if (webViewDB == null) {
  View adView = findViewById(R.id.adView);
  if (adView != null)
    adView.setVisibility(View.GONE);
}

Anyhow, as far as I remember this issue was fixed in the Android OS 2.3+, so until this OS version will catch you have to disable the ads to people with this problem.