From the error, it looks like you haven't printed out any HTTP headers. Try print header(); before calling print $pjx->build_html. Also, you might want to actually make use of that $config hashref you've setup there in your call to Template->new( $config ).

Also, if CGI::Ajax is building some HTML, what's Template going to do for you?

Unfortunately not using CGI::Ajax, but just T::T (which is where I think you're hitting a snag), the following snippet might help:

#!/usr/bin/perl

use strict;
use warnings;

use Template;
use CGI qw/:standard/;
 # ...
print header(-charset=>'utf-8');

my $vars = { # ... blah blah blah
              };
my $template = Template->new(
  INCLUDE_PATH => '/www/path_to_blah/templates/',
);

$template->process( q/template.tt/, $vars );
[download]

s**lil*;  $*=join'',sort split q**;  s;.*;grr; &&s+(.(.)).+$2$1+; $; =
qq-$_-;s,.*,ahc,;$,.=chop for split q,,,reverse;print for($,,$;,$*,$/)
[download]