perl executon failed error

Hello, could someone please help me diagnose and fix this error? It displays when I log into usermin.

Error - Perl execution failed

Can’t use an undefined value as a symbol reference at /usr/share/usermin/mailbox/ line 1988, line 1.

Related post:


Are you able to check email via others means, such as Outlook/Thunderbird? Or do you have problems logging in using any client?