I've installed LISTSERV on my unix machine and can't get it to run. When I type "go", I get an error message that says ">>> Cannot create '/listserv.PID' <<<". What do I do?

This is caused by the LISTSERV spool directory being either not defined or set to the empty string. Check go.user and go.sys to see if the spool directory is correctly defined, typically as something like "/home/listserv/spool ".