[phplib template] file does not exist

Hi,

i'm having a problem. I just installed a webserver with mysql and php. I
copied my files that i had stored on another webserver to my new. I didn't
change anything to these files and the files worked fine on the other
server.

Now in this server i get this error with a template:
    Template Error: filename: file ./templates/nav_left_body.tpl.php does
not exist.
    Halted

But that file does exist. I can see it through ftp an i can get to it via
http browser.

What could be wrong? Could it be a config failure in my php.ini? Or in
httpd.conf? In case it is the config, what could it be?

Thanks in advance!!