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Analysing the stack error, Processing tracks "ascii name" when calling Saga alg "Contour lines from grid" iso_in_layer = processing.runalg("saga:contourlinesfromgrid", my_new_raster, isoMin, isoMax, isoInterlignes, None) The grid my_new_raster has an unicode name created by saga:clipgridwithpolygon Processing trace : print 'Unable to execute algorithm\n' + msg UnicodeEncodeError "ascii" .... Pushing the question to Qgis.
