<div dir="ltr"><img width="0" height="0" class="mailtrack-img" alt="" style="display:flex" src="https://mailtrack.io/trace/mail/4790cfbaf39d64c696d840259962559ef60d0b91.png?u=651070"><div></div><font color="#202124" face="Roboto, RobotoDraft, Helvetica, Arial, sans-serif"><span style="font-size:12.8px">I know I should read the documentation just not sure where to find it. I'm trying to do a slope analysis of a DEM raster layer... I get the following python stack trace:</span></font><div><font color="#202124" face="Roboto, RobotoDraft, Helvetica, Arial, sans-serif"><span style="font-size:12.8px"><br></span></font><div>snip---------------</div><div>
<p style="margin:0px;white-space:pre-wrap"><span style="font-weight:600;color:rgb(255,0,0)">An error has occurred while executing Python code:</span> <br></p>
<p style="margin:14px 0px 12px;white-space:pre-wrap"><span style="font-size:large;font-weight:600">AttributeError: 'slope' object has no attribute 'preprocessParameters' </span></p>
<pre style="margin:12px 0px"><span style="font-family:"Courier New"">Traceback (most recent call last):<br>  File "C:/PROGRA~1/QGIS3~1.0/apps/qgis/./python/plugins\processing\gui\menus.py", line 181, in <br>    action.triggered.connect(lambda: _executeAlgorithm(alg))<br>  File "C:/PROGRA~1/QGIS3~1.0/apps/qgis/./python/plugins\processing\gui\menus.py", line 227, in _executeAlgorithm<br>    dlg = alg.createCustomParametersWidget(None)<br>  File "C:/PROGRA~1/QGIS3~1.0/apps/qgis/./python/plugins\processing\algs\gdal\GdalAlgorithm.py", line 62, in createCustomParametersWidget<br>    return GdalAlgorithmDialog(self)<br>  File "C:/PROGRA~1/QGIS3~1.0/apps/qgis/./python/plugins\processing\algs\gdal\GdalAlgorithmDialog.py", line 58, in __init__<br>    self.mainWidget().parametersHaveChanged()<br>  File "C:/PROGRA~1/QGIS3~1.0/apps/qgis/./python/plugins\processing\algs\gdal\GdalAlgorithmDialog.py", line 110, in parametersHaveChanged<br>    parameters = self.parent.getParameterValues()<br>  File "C:/PROGRA~1/QGIS3~1.0/apps/qgis/./python/plugins\processing\gui\AlgorithmDialog.py", line 119, in getParameterValues<br>    return self.algorithm().preprocessParameters(parameters)<br>AttributeError: 'slope' object has no attribute 'preprocessParameters'<br></span></pre>
<p style="margin:0px;white-space:pre-wrap"><br><span style="font-weight:600">Python version:</span> 3.6.0 (v3.6.0:41df79263a11, Dec 23 2016, 08:06:12) [MSC v.1900 64 bit (AMD64)] <br><span style="font-weight:600">QGIS version:</span> 3.0.0-Girona Girona, 001c80b0c3 </p><br></div><div>end snip-----------------------</div><div><br></div><div>So I'm wondering if I need to set anything up for QGIS is use python modules. Or where one sets up preprocessing Parameters. Any good tutorials on loading DEMs. configuring properties, and running analysis. Thanks,</div><div>Larry</div><div><br></div><div> </div><div><br></div><div><br><br></div><br><div class="mt-signature">
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