I get this error

"Call to a member function getBackend() on a non-object admin blank page"

Also the admin page is blank, so what could be the issue. I tried deleting all cache from /var/cache folder already! Tried disabling all the modules by renaming all those xml files.

I tried to check the magento installation by using magento-check.php and it shows http://prntscr.com/6v3ny3

PHP version: http://prntscr.com/6v3och

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