Problem with getFilenameOnFilestore() after upgrading to 1.8.16

Hi,  i have a image  upload perfectly working and i was working with elgg  1.8.13. Now i upgaded into elgg1.816 and unfortunatly it's not working and found that the function  getFilenameOnFilestore() giving null.

 

this is the code :

$file = new ElggFile();

return $file->getFilenameOnFilestore()

Anybody experiecing this same issue ?  Somebody please help me.

Thank you very much!

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