[mrtg] MRTG Wont display charts

[JAMIE CRAWFORD]

Hi,
Trying to get MRTG to work on my Redhat 7.3 box.  I can get everything
to display but the charts.  I can get this to work on my XP box fine,
but as usual I am having a headache trying to get this to work under
linux.  Any help is appreciated.
Thanks
Jamie Crawford

OS:
Redhat 7.3

RPMS that are installed
mrtg-2.9.22-2..2.i386.rpm
gd-1.8.4-4.i386.rpm
libpng-1.0.12-2.i386.rpm 


ERROR:
[root at predator mrtg]# mrtg /etc/mrtg/mrtg.cfg                           
      
gd-png:  fatal libpng error: Invalid filter type specified
gd-png error: setjmp returns error condition


CONTENTS OF /etc/mrtg/mrtg.cfg

# Created by 
# /usr/bin/cfgmaker --output /etc/mrtg/mrtg.cfg public at 153.91.139.1


### Global Config Options

#  for UNIX
WorkDir: /var/www/html/mrtg

#  or for NT
# WorkDir: c:\mrtgdata

### Global Defaults

#  to get bits instead of bytes and graphs growing to the right
# Options[_]: growright, bits


######################################################################
# System: BayStack Ethernet NMM
# Description: Bay Networks Inc., BayStack Ethernet Adv NMM Agent
V2.0.0, 
#          Compile Date: Jun 27 1997, Time: 15:23:36
# Contact: Network Services
# Location: Foster 1st Floor
######################################################################


### Interface 1 >> Descr: 'et01' | Name: '' | Ip: '153.91.139.1' | Eth:
'00-00-81-0e-57-f8' ###

Target[153.91.139.1_1]: 1:public at 153.91.139.1:
SetEnv[153.91.139.1_1]: MRTG_INT_IP="153.91.139.1" MRTG_INT_DESCR="et01"
MaxBytes[153.91.139.1_1]: 1250000
Title[153.91.139.1_1]: Traffic Analysis for 1 -- BayStack Ethernet NMM
PageTop[153.91.139.1_1]: <H1>Traffic Analysis for 1 -- BayStack Ethernet
NMM</H1>
 <TABLE>
   <TR><TD>System:</TD>     <TD>BayStack Ethernet NMM in Foster 1st
Floor</TD></TR>
   <TR><TD>Maintainer:</TD> <TD>Network Services</TD></TR>
   <TR><TD>Description:</TD><TD>et01  </TD></TR>
   <TR><TD>ifType:</TD>     <TD>ethernetCsmacd (6)</TD></TR>
   <TR><TD>ifName:</TD>     <TD></TD></TR>
   <TR><TD>Max Speed:</TD>  <TD>1250.0 kBytes/s</TD></TR>
   <TR><TD>Ip:</TD>         <TD>153.91.139.1 ()</TD></TR>
 </TABLE>


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