.dso error while runnig the app in device..

hello friends

Actually my app was running fine in simulator..
while running it in the device the following error occurs

Quote:

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No rule to make target `\NokiaQtSDK\Symbian\SDK\epoc32\release\armv5\LIB\ qfacebook.dso', needed by
"\NokiaQtSDK\Symbian\SDK\epoc32\release\armv5\ lib" folder.

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so anyone know hw to solve it