[Merkuri]

Make sure you know what the target server is running. Apache SSI syntax is different from Nginx SSI syntax (and I think also different from Lighty).

EDIT: Quoting the whole OP is a bit obnoxious.

EDIT: Relevant documentation

Apache: https://httpd.apache.org/docs/2.2/howto/ssi.html
Nginx: http://wiki.nginx.org/HttpSsiModule
Lighty: http://redmine.lighttpd.net/projects/1/wiki/docs_modssi

Thanks, I love when somebody add something I forget