[freeside-users] invoice pdf error

[John]

Freeside 1.5.7 on slackware linux 10.2, perl 5.8.7, postgres 8.0.3, using
radiator + 2 acct hooks for inserting session information into a freeradius
style accounting table. latex is  Version 3.14159 and ghostscript is version
8.54-gpl.

I have been attempting to use the pdf invoice as attachment feature for
emailed invoices.  When I click re-email this invoice I get the following
error and some advice would be appreciated-

      error:  pslatex
/usr/local/etc/freeside/cache.DBI:Pg:dbname=freeside/invoice.659.wkxxxDN1.te
x failed; see
/usr/local/etc/freeside/cache.DBI:Pg:dbname=freeside/invoice.659.wkxxxDN1.lo
g for details?

      context:  ...
            1690:  #! LaTeX Error: Unknown graphics extension: .eps.
            1691:
            1692:  my $sfile = shell_quote $file;
            1693:
            1694:  system("pslatex $sfile.tex >/dev/null 2>&1") == 0
            1695:  or die "pslatex $file.tex failed; see $file.log for
details?\n";
            1696:  system("pslatex $sfile.tex >/dev/null 2>&1") == 0
            1697:  or die "pslatex $file.tex failed; see $file.log for
details?\n";
            1698:
            ...

      code stack:  /usr/local/lib/perl5/site_perl/5.8.7/FS/cust_bill.pm:1694
      /usr/local/lib/perl5/site_perl/5.8.7/FS/cust_bill.pm:549
      /usr/local/lib/perl5/site_perl/5.8.7/FS/cust_bill.pm:480
      /usr/local/lib/perl5/site_perl/5.8.7/FS/cust_bill.pm:627
      /usr/local/apache/htdocs/freeside/misc/email-invoice.cgi:11
      /usr/local/apache/htdocs/freeside/autohandler:1