IabHelper class not working? : <p>I have implemented the IabHelper class in my android project and it says that the 'getBuyIntentToReplaceSkus' cannot be resolved. The full method:</p>

<pre><code>buyIntentBundle = mService.getBuyIntentToReplaceSkus(5,
mContext.getPackageName(),oldSkus, sku, itemType, extraData);
</code></pre>

<p>I implemented in app billing in my project but I have not yet created any items to be purchased, though the rest of the methods don't have any problems.</p>
