Currently there's a function
WP_Error::has_errors
being used in GiveWP that was introduced in WordPress version 5.1.1.
Running older versions of WordPress currently causes a fatal error on activation:
`
Uncaught Error: Call to undefined method WP_Error::has_errors() in /home/s1011999/public_html/wp-content/plugins/give/src/Framework/Database/DB.php:78
`