Facebook Connect login dialog not getting displayed on iphone with new facebook-ios-sdk

I am using new new Facebook-ios-sdk did everything what is informed in README.mdown. while running this app. It didnt showed me anything. But when i kept break point in show in Fbdialog here:

UIWindow* window = [UIApplication sharedApplication].keyWindow; 
if (!window) {
    window = [[UIApplication sharedApplication].windows objectA开发者_JS百科tIndex:0]; 
} 

If any one can help me out with this it will be really great.

thanks, Aby

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Problem was with the APPID which we also need to provide in the plist.