[smokeping-users] xport problem

[Thusitha Sumanadasa]

hey
 I read http://oss.oetiker.ch/rrdtool/doc/rrdxport.en.html and it was hard
to understand ;) . And I create a command line by reading above link ,But
it gives an error.

Here are my data .

file name-xxx.rrd
file path- /var/lib/smokeping/Local/ .
steps – 60 sec.

and this is my terminal code-
 rrdtool xport –json -s $(date -d “10 mins ago” +%s) -e $(date +%s) –step
60 DEF:load_1min_avg=/var/lib/smokeping/Local/xxx.rrd:shortterm:AVERAGE
XPORT:load_1min_avg

but it gives this error-
ERROR: No DS called ‘shortterm’ in ‘/var/lib/smokeping/Local/xxx.rrd’

What is the wrong here.Give some help.
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