Interface RRD creation problem

[paintcheck200]

I"m having problems creating the rrd fot bytes in and out

My Data Source Debug is

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/usr/bin/rrdtool create \
/var/www/localhost/htdocs/control/cacti/rra/localhost_traffic_in_27.rrd \
--step 300  \
RRA:AVERAGE:0.5:1:600 \
RRA:AVERAGE:0.5:6:700 \
RRA:AVERAGE:0.5:24:775 \
RRA:AVERAGE:0.5:288:797 \
RRA:MAX:0.5:1:600 \
RRA:MAX:0.5:6:700 \
RRA:MAX:0.5:24:775 \
RRA:MAX:0.5:288:797 \

When I run this I get

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ERROR: you must define at least one Data Source

I don't understand what the heck is going on here. I've been playin with cacti for a few days know and I'm knew to RRD.