FUNDRAISING PLUGIN: payment gateway error

Hello,

Hope everybody is doing well..

I am getting an Fatal error after filling out the pledge page to continue to Paypal checkout
Fatal error: Cannot use object of type WP_Error as array in /home1/documen1/public_html/precedencehomehealthcare.com/wp-content/plugins/fundraising/lib/gateways/paypal.php on line 224.
This is the link to the site: http://precedencehomehealthcare.com/fundraising-campaign/

Please, need help to resolve this payment gateway issue.

Thanks

Regards