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This is an incompatibility between the .rrd file (created by RRDTool v2.x), and the RRDs Perl libraries used by routers2 (RRDTool v1.x).
It looks as if you have both versions of the RRD libraries installed on your system at the same time, and MRTG is using the v2.x and routers2 is using the v1.x.
To solve this, remove the old version 1.x libraries, and properly install the v2.x libraries into the site_perl path. You may currently have v1.x in site_perl, but directed MRTG to use the v2.x by using the LibPath directive?
_________________ Steve Shipway UNIX Systems, ITSS, University of Auckland, NZ Woe unto them that rise up early in the morning... -- Isaiah 5:11
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