getlastmod() returns error??

Hi, I am using getlastmod() to create a META HTTP-EQUIV tag. However, getlastmod() SOMETIMES returns FALSE (for error). When I run PHP from a Perl script, getlastmod() returns FALSE. When I run it from the command line, it returns the correct information. I usually use a Perl script to process a directory of PHP files. It pipes them to HTML files in another directory, and I upload those to my server as static pages. I am using Mandrake Linux v8.1 and PHP v4.0.6. Andrew Ziem http://www.springsrescuemission.org