Fatal error: Cannot redeclare get_file_description() (previously declared in /home

Hello every one.
My issue is i have make one clone of sub domain form my site with staging but when i have run staging site i have getting below error.

Fatal error: Cannot redeclare get_file_description() (previously declared in /home

I have follow below steps: Upload all care file exclude of(wp-config.php,htaccess,and wp-content directory)

Check every file have not any static live url define in my site.

also rename sub domain with new sub domain and move all file there but cant solve.

Please give me a proper guide for solve this issue.

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