[Qgis-user] Interpolation plugin error message

[antonio scotti]

Hi all, I am new to this forum and to QGIS
I am trying to construct a DEM from contour lines by using QGIS 2.14.0.I am doing this by using a clip rectangle on top of the contour lines and interpolating, by using the interpolation plugin
After I enter the data in the interpolation dialog and clic Save  I get an exception (se attached file). 
Any help appreciated

Best regards =============================================== 
PermaCultura-es http://www.permacultura-es.org
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