you have 2 Template folders
/Templates
/templates
note the case of the T.
this code is looking in the folder with the upper case T:
$WA_meridian_template_1403564859704_Template = new WA_Include("Templates{$WA_meridian_template_1403564859704_Content_Empty}/meridian_template.dwt.php");
but the template file does not exist there, it exists in the lower case version.
i changed it to use the lower case t:
$WA_meridian_template_1403564859704_Template = new WA_Include("templates{$WA_meridian_template_1403564859704_Content_Empty}/meridian_template.dwt.php");