Login button in facebook sdk doesn't click

hello, i am making a test on an iOS app that support login via facebook, google and tweeter, the username and password textfield works, but when i click on the login button to authenticate the button doesn’t click

what error are you getting, also can you post the xml of the app

i’m not getting an error, but the code in this case is without funcionality

                <UIAButton name="Log In" label="Log In" value="" dom="[object Object]" enabled="true" valid="true" visible="true" hint="" path="/0/0/2/0/6" x="16" y="391" width="343" height="36">