Can't install any android apps on my Xperia U handset.

I have tried to install several Apps on My "Xperia U" which i bought few days ago. Now when i go to Google Play store and tried to install the apps i got this notification
This app is incompatible with your WTBL Sony Ericsson ST25i.
WTBL Sony Ericsson ST25i
You have not opened the Google Play Store app recently on this device. Please open it and try again
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