[mrtg] Redhat Linux 8.0 Errors

[Geoff Berry]

Hi..
I have mrtg-2.9.25-1.7.2 installed Redhat Linux 8.0 and am getting lots of errors (see below) when trying to run mrtg from the command line.  I have tried several older versions of mrtg, but still get similar errors. I have tried finding answers on the net, and have got rig of the lang error, but still have several errors which I can't find a solution to.  I have replaced IP with xxx.xxx.xxx.xxx in errors below. Any advice would be great.
Thanks in advance

Use of uninitialized value in string eq at /usr/bin/../lib/mrtg2/MRTG_lib.pm line 1143.
Use of uninitialized value in string eq at /usr/bin/../lib/mrtg2/MRTG_lib.pm line 1143.
Use of uninitialized value in string eq at /usr/bin/../lib/mrtg2/MRTG_lib.pm line 1144.
Use of uninitialized value in string eq at /usr/bin/../lib/mrtg2/MRTG_lib.pm line 1144.
Use of uninitialized value in substitution (s///) at /usr/bin/../lib/mrtg2/MRTG_lib.pm line 1145.
Use of uninitialized value in substitution (s///) at /usr/bin/../lib/mrtg2/MRTG_lib.pm line 1146.
Use of uninitialized value in concatenation (.) or string at /usr/bin/../lib/mrtg2/MRTG_lib.pm line 1154.
Use of uninitialized value in concatenation (.) or string at /usr/bin/../lib/mrtg2/MRTG_lib.pm line 1154.
Use of uninitialized value in string eq at /usr/bin/mrtg line 1554.
Use of uninitialized value in string eq at /usr/bin/mrtg line 1554.
Use of uninitialized value in substitution (s///) at /usr/bin/mrtg line 1560.
Use of uninitialized value in hash element at /usr/bin/mrtg line 1561.
Use of uninitialized value in hash element at /usr/bin/mrtg line 1561.
Use of uninitialized value in hash element at /usr/bin/mrtg line 1565.
Use of uninitialized value in hash element at /usr/bin/mrtg line 1565.
Use of uninitialized value in concatenation (.) or string at /usr/bin/mrtg line 1566.
Use of uninitialized value in concatenation (.) or string at /usr/bin/mrtg line 1566.
WARNING: Could not match host:'xxx at xxx.xxx.xxx.xxx:' ref:'' key:''
WARNING: Expected a number but got '(null)'
WARNING: Expected a number but got '(null)'
WARNING: Expected a number but got '(null)'
WARNING: Expected a number but got '(null)'
ERROR: Target[xxx.xxx.xxx.xxx_0][_IN_] ' $$target[0]{$mode} ' did not eval into defined data
ERROR: Target[xxx.xxx.xxx.xxx_0][_OUT_] ' $$target[0]{$mode} ' did not eval into defined data
WARNING: Skipping Update of xxx.xxx.xxx.xxx_0, inlast is not defined
WARNING: Skipping Update of xxx.xxx.xxx.xxx_0, outlast is not defined
ERROR: Target[xxx.xxx.xxx.xxx_2][_IN_] ' $$target[1]{$mode} ' did not eval into defined data
ERROR: Target[xxx.xxx.xxx.xxx_2][_OUT_] ' $$target[1]{$mode} ' did not eval into defined data
WARNING: Skipping Update of xxx.xxx.xxx.xxx_2, inlast is not defined
WARNING: Skipping Update of xxx.xxx.xxx.xxx_2, outlast is not defined
ERROR: Target[xxx.xxx.xxx.xxx_3][_IN_] ' $$target[2]{$mode} ' did not eval into defined data
ERROR: Target[xxx.xxx.xxx.xxx_3][_OUT_] ' $$target[2]{$mode} ' did not eval into defined data
WARNING: Skipping Update of xxx.xxx.xxx.xxx_3, inlast is not defined
WARNING: Skipping Update of xxx.xxx.xxx.xxx_3, outlast is not defined
gd-png:  fatal libpng error: Invalid filter type specified
gd-png error: setjmp returns error condition
gd-png:  fatal libpng error: Invalid filter type specified
gd-png error: setjmp returns error condition
gd-png:  fatal libpng error: Invalid filter type specified
gd-png error: setjmp returns error condition
gd-png:  fatal libpng error: Invalid filter type specified
gd-png error: setjmp returns error condition
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