to do this, go into your phone’s settings, then Applications (or Apps or Application Manager), swipe to the left to ”All” and scroll down until you find Google Play, tap on it.
2) In the app information page, tap on the button to empty the cache.
3) If this doesn’t solve the problem, try to delete the data from the Play Store which is found on the same page (Settings > Manage applications > Google Play > Delete data). This will most probably work, since it had worked in my case when I suffered with the problem in my android.