Site errors due to Acymailing plugin

jross

Hi, I have a J3.10.5 website running PHP7.4.
When in the backend, there are various pages that return a blank white screen when I try to access them. I turned on Error Reporting and got the following report. It indicates a problem with an Acymail plugin/file?

Warning: require_once(/home/bylscwln/public_html/administrator/components/com_acymailing/helpers/helper.php): failed to open stream: No such file or directory in /home/bylscwln/public_html/plugins/system/regacymailing/regacymailing.php on line 38

Is anybody able to suggest what to do to fix this issue?

Thanks, JR

mihha

You still have plugins and modules from version 5 installed on your site

Please remove them and all should be good