cutting and pasting text in LyX document error

[Wolfgang Engelmann]

If I cut and paste text from literature in e.g. Jabref in a LyX document 
I get this error
An error occurred while running:
python -tt $$s/scripts/html2latexwrapper.py gnuhtml2latex
"Buffer_importStringMHQHEd.html" "Buffer_importStringMHQHEd.tex"

Not important, since it includes the pasted text in spite of the warning.

Just curious
Wolfgang