Are you certain that your problem is related at all to MIME::Lite::TT::HTML? I see no mention of the string "requires" within its distribution.

Unrelated, I find the error message to be quite clear. Whatever program you are running wants to run as the user account root or Trustuser. One solution could be to run whatever program as that user instead of the web server user. The better approach would be to first find out why a program would want to be run (only) as root. There is very little reason to run a program as root, but without knowing what the program wants to do, it's hard to propose alternative approaches.