New Error, need help

Did everything, then I get this. 

Warning: file_get_contents() [function.file-get-contents]: Unable to access ./include/template/main.tpl in /www/12gbfree.com/c/b/n/cbnj/htdocs/forum/header.php on line 43

Warning: file_get_contents(./include/template/main.tpl) [function.file-get-contents]: failed to open stream: No such file or directory in /www/12gbfree.com/c/b/n/cbnj/htdocs/forum/header.php on line 43