Problems with suexec

Hi, my suexec Logfile says:

[2003-05-09 10:32:31]: info: (target/actual) uid: (www/www) gid: (www/www)
cmd: mason_handler.fcgi

[2003-05-09 10:32:31]: error: command not in docroot
(/opt/rt3/bin/mason_handler.fcgi)

What does that mean? What do i have to do?

Thank you!

Manuel