Any word on this, I have started receiving the same error. My difference is I am only using BackWPup Version 3.6.0, with a plugin I am developing.
Catchable fatal error: Argument 1 passed to Aws\Common\Client\AbstractClient::__construct() must be an instance of Aws\Common\Credentials\CredentialsInterface, array given, called in /path/to/my/plugin/myfile.php on line 32 and defined in /fullpath/httpdocs/wp-content/plugins/backwpup/vendor/aws/aws-sdk-php/src/Aws/Common/Client/AbstractClient.php on line 73
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This reply was modified 6 years, 5 months ago by a2adv.