Cyclictest histogram

Hello community,

I wanted to used the script found on http://www.osadl.org/Create-a-latency-plot-from-cyclictest-hi.bash-script-for-latency-plot.0.html to plot a latency histogram. I only changed the number of cores and wanted to used duration instead of loops. Apart from that I didn't change anything. I keep getting get this:

line 0: warning: Skipping data file with no valid points
line 0: warning: Skipping data file with no valid points

Does someone have an example so that I can understand the process more ?

Thanks :D