<html><head></head><body><div style="color:#000; background-color:#fff; font-family:Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px"><div id="yui_3_16_0_ym19_1_1488909497349_57913"><span id="yui_3_16_0_ym19_1_1488909497349_59490">Hi all, I am new to this forum and to QGIS<br></span></div><div id="yui_3_16_0_ym19_1_1488909497349_59471" dir="ltr"><span id="yui_3_16_0_ym19_1_1488909497349_145856">I am trying to construct a DEM </span><span id="yui_3_16_0_ym19_1_1488909497349_145862">from contour lines by using </span><span id="yui_3_16_0_ym19_1_1488909497349_145863">QGIS 2.14.0.</span></div><div dir="ltr" id="yui_3_16_0_ym19_1_1488909497349_148839"><span id="yui_3_16_0_ym19_1_1488909497349_145863">I am doing this by using a clip rectangle on top of the contour lines and interpolating, by using the interpolation plugin</span></div><div dir="ltr" id="yui_3_16_0_ym19_1_1488909497349_155016"><span id="yui_3_16_0_ym19_1_1488909497349_145863"><br></span></div><div dir="ltr" id="yui_3_16_0_ym19_1_1488909497349_155021"><span id="yui_3_16_0_ym19_1_1488909497349_145863">After I enter the data in the interpolation dialog and clic Save I get an exception (se attached file). <br></span></div><div dir="ltr" id="yui_3_16_0_ym19_1_1488909497349_178085"><span id="yui_3_16_0_ym19_1_1488909497349_145863">Any help appreciated<br></span></div><br><div dir="ltr" id="yui_3_16_0_ym19_1_1488909497349_136327"><span id="yui_3_16_0_ym19_1_1488909497349_59483">Best regards</span></div><div id="yui_3_16_0_ym19_1_1488909497349_59484"> </div><div class="signature" id="yui_3_16_0_ym19_1_1488909497349_59485">=============================================== <br>PermaCultura-es http://www.permacultura-es.org</div></div></body></html>