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<body><div>Hi,</div><div>from my experiences longer ago, the interpolation plugin is not really easy to use and seems not to be maintained/enhanced for a long time.</div><div><br></div><div>Maybe you can find a substitute for your interpolation tasks in the Processing toolbox?</div><div><br></div><div>Cheers</div><div>Bernd</div><div><br></div><div>Am 08.03.2017, 00:23 Uhr, schrieb antonio scotti <kiaikidobcn@yahoo.com>:<br></div><br><blockquote style="margin: 0 0 0.80ex; border-left: #0000FF 2px solid; padding-left: 1ex"><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></blockquote><br><br><br><div id="M2Signature"><div>-- </div><div>Bernd Vogelgesang<br>Siedlerstraße 2<br>91083 Baiersdorf/Igelsdorf<br>Tel: 09133-825374</div></div></body></html>