Moving WordPress to New Hosting Account

I moved my website to a new hosting account by copying over the wordpress files using ftp and exporting and then importing the database using myphpadmin. I deleted the old site but things don’t seem to be working correctly. I’m seeing warnings like this on the wordpress admin dashboard:

public_html/wp-content/plugins/backwpup/inc/../sdk/Aws/Symfony/Component/ClassLoader/UniversalClassLoader.php) [function.include]: failed to open stream: No such file or directory in /home/public_html/wp-content/plugins/backwpup/inc/class-destination-s3.php on line 6