Problem HTML Templates

Hi everyone
I've a problem with the section HTML Templates.
When I try to load any file .tpl I can't edit nothing and this message appears :

Warning: fopen(/home/one4sal/public_html/classifieds/admin/templates_new_src/6) [function.fopen]: failed to open stream: No such file or directory in /home/one4sal/public_html/classifieds/admin/adm_html_edit.php on line 147

Warning: filesize() [function.filesize]: stat failed for /home/one4sal/public_html/classifieds/admin/templates_new_src/6 in /home/one4sal/public_html/classifieds/admin/adm_html_edit.php on line 148

Warning: fread(): supplied argument is not a valid stream resource in /home/one4sal/public_html/classifieds/admin/adm_html_edit.php on line 148

Someone do you know why ? What's wrong ?

Thanks