[Orgmode] plotting when x-axis has non-numeric data

[henry atting]

I have a table which I am plotting longly, it looks like this:

#+PLOT: title:"expenses" ind:1  type:2d with:lines 
#+PLOT:  set:"yrange [0:]" labels:("month" "expenses" "average") 
| month       |   two |three|
|------------+--------+-----|
| November    | 500   | 500 |
| December    | 500   | 500 |
| January     | 600   | 500 |
| February    | 400   | 500 |

Thus far it was no problem that the x-axis contains non-numeric data.
Now gnuplot stops with this error message:

gnuplot> plot '/tmp/org-plot18686CtJ' using 1:3:xticlabel(1) with lines title 
'H-index'
           warning: Skipping data file with no valid points
          x range is invalid

When I try to plot the table 'Citas' from this tutorial [1] I get the
same error message. 

henry

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[1] http://orgmode.org/worg/org-tutorials/org-plot.php


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