[Owncloud] \OC\Files\Filesystem::getPath($fileId);

[Tharindu Dhananjaya Galappaththi]

I'm trying to call "\OC\Files\Filesystem::getPath($fileId);" method from a
guest page. But it gives me this error.

PHP Fatal error:  Call to a member function getPath() on a non-object in
/var/www/owncloud5/lib/files/filesystem.php on line 638,


Since the guest page is loaded with out a user being logged in, this error
occurs.
when a user is logged in to the ownCloud, this error doesn't happen.

Please help.
Thank You
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