google map in android application

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Java

Mobile

Android

Google-Maps

hii..
i m trying with the android application which shows the current location of user...
but map is not shown on emulator...only gray blocks are shown..

main.xml file shows the following error ,,

Missing styles. Is the correct theme chosen for this layout?
Use the Theme combo box above the layout to choose a different layout, or fix the theme style references.

Failed to find style 'mapViewStyle' in current theme

plz suggest any solution for this error..