I'm getting following error message:
File "pyxfile.py", line 42, in ?
    g.writePDFfile("pic_6.pdf")
  File "/pyx/canvas.py", line 330, in wrappedindocument
  File "/pyx/document.py", line 161, in writePDFfile
  File "/pyx/pdfwriter.py", line 475, in __init__
  File "/pyx/pdfwriter.py", line 155, in __init__
  File "/pyx/pdfwriter.py", line 212, in __init__
  File "/pyx/pdfwriter.py", line 238, in __init__
  File "/pyx/pdfwriter.py", line 267, in __init__
  File "/pyx/document.py", line 141, in processPDF
  File "/pyx/document.py", line 81, in _process
  File "/pyx/graph/graph.py", line 166, in processPDF
  File "/pyx/graph/graph.py", line 270, in finish
  File "/pyx/graph/graph.py", line 502, in dokey
  File "/pyx/graph/key.py", line 106, in paint
  File "/pyx/graph/key.py", line 85, in paintcolumn
  File "/pyx/text.py", line 1222, in text_pt
  File "/pyx/text.py", line 1201, in text
  File "/pyx/text.py", line 1044, in finishdvi
  File "/pyx/text.py", line 1036, in execute
pyx.text.TexResultError: unhandled TeX response (might be an error)
The expression passed to TeX was:
  \end%
After parsing the return message from TeX, the following was left:
  *! Missing $ inserted.
  <inserted text>
                  $
  <to be read again>
                     \end
  (cut after 5 lines, increase errordebug for more output )



My Code :

from pyx import *

g = graph.graphxy(width = 8,key = graph.key.key())

g.plot(graph.data.file("lum_bw_6",x=1,y=2,title="Luma_BW"),
       styles = [ graph.style.line([color.rgb.red,
                        style.linestyle.solid,
                        style.linewidth.thick])])
g.plot(graph.data.file("chr_bw_6",x=1,y=2,title="Chroma_BW"),
       styles = [ graph.style.line([color.rgb.green,
                        style.linestyle.solid,
                        style.linewidth.thick])])

g.writePDFfile("pic_6.pdf")


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