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I've done a fresh install of 1.7.7.3 with no errors. When I go to Back Office and enter the credentials it loads a blank page except for the Prestashop Logo, store name and copywrite info. The webserver is running PHP 7.4 (I've also tried 7.2 and 7.3) and MySQL version 5.7.28. I get the same result in multiple browsers and clearing the browser cache does nothing. 

Front Office loads normally. 

Any assistance offered is appreciated. 

Error: Deprecated: array_key_exists(): Using array_key_exists() on objects is deprecated. Use isset() or property_exists() instead in /Site path/src/Adapter/EntityMapper.php on line 99

I've done a fresh install of 1.7.7.3 with no errors. When I go to Back Office and enter the credentials it loads a blank page except for the Prestashop Logo, store name and copywrite info. The webserver is running PHP 7.4 (I've also tried 7.2 and 7.3) and MySQL version 5.7.28. I get the same result in multiple browsers and clearing the browser cache does nothing. 

Front Office loads normally. 

Any assistance offered is appreciated.