PHP fatal error to backup to AWS

I link updraft to AWS and when scan remote storage, it shows as below:

PHP Fatal error (Error) has occurred during rescan subaction. Error Message: Call to a member function search() on bool (Code: 0, line 405 in /home/*****.cloudwaysapps.com/kuzdbcjhsj/public_html/wp-content/plugins/updraftplus/methods/dropbox.php)