Nagiosgraph problem

[Alberto]

I get this in nagiosgraph.log:

CGI error: RRDs::graph ERR can't make a graph without contents

I get the blue screen of nagiosgraph but no images on it... what is the
probleam? I have no data on rrd/ folder but if I execute insert.pl manually
as nagios user I get date in the folder but if I delete it and run nagios it
doesnt generate rrd files.
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