Multilingual website page not found problem

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Dear All,
i am building my first website using Concrete5 . While i was working on applying the multilingual functionality , it broke down .. i am trying to change the language of a page , it says : No page found .
Multilingual --> Setup . then i choose a language but no language icon appears , it gives : none and when pressing add content section , it gives : No page found..

Please can anyone help ???

Thank you...