An error has occurred in the program

bad logfile name [ ] at /home/actercoa/safefoodkenya.com/cgi-bin/TFmail.pl line 1048. 

My TFmail.pl line 1048- 1053 looks like this:

 my $file = $treq->config('logfile', '');
   $file = $treq->process_template("\%$file",'email', undef);
   return unless $file;
   $file =~ m#^([\/\-\w]{1,100})$# or die "bad logfile name [$file]";
   $file = $1;

   open LOG, ">>@{[ LOGFILE_ROOT ]}/$file@{[ LOGFILE_EXT ]}" or die "open [$file]: $!";
   flock LOG, LOCK_EX or die "flock [$file]: $!";
   seek LOG, 0, 2 or die "seek to end of [$file]: $!";