problem in images , avatar or any uploaded photo


I'm (Soooo) new to elgg and i have a problem in avatar or any uploaded images , i've created a data directory with the name "data",

everytime i upload an image it didn't show up, instead i got aan empty  square  with link to image , and in avatar it says avatar successfully uploaded !, but not showing anything even in preview !

am i doing something wrong?!

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