[Solved] Server error message

We've been getting errors like this in our server logs:

2021/04/17 06:07:53 [error] 25757#25757: *391451 FastCGI sent in stderr: "PHP message: PHP Warning: is_dir(): open_basedir restriction in effect. File(/home/rq45bqg7/public_html/wp-content/plugins/wpdiscuz/themes/default) is not within the allowed path(s): (/www/genes2teenscom_329/public:/www/genes2teenscom_329/mysqleditor:/www/genes2teenscom_329/web:/www/genes2teenscom_329/deploy:/www/genes2teenscom_329/deployment:/www/genes2teenscom_329/deployments:/usr/share:/tmp) in /www/genes2teenscom_329/public/wp-content/plugins/wpdiscuz/forms/wpdFormAttr/Form.php on line 137" while reading response header from upstream, client: 55.153.94.156, server: genes2teens.com, request: "GET /home-birth-what-to-know-about-giving-birth-at-home/ HTTP/1.0", upstream: "fastcgi://unix:/var/run/php7.3-fpm-genes2teenscom.sock:", host: "genes2teens.com"

Can you please advise what we need to change here. We did recently change hosting companies, if that might have had some effect. Can you please advise what we can do to stop this error from being generated?