New answers tagged contour
You're talking about the Contour Lines From Points model. I still have 2.4, I saved it for you as a .model Link to Dropbox
I reinstalled QGIS version 2.6.1. Now the problem is solved.
That is not an error. The data are points also for WMS but the advanced SLD with transformations creates a visual presentation with contour lines on-a-fly. The purpose of WFS is to deliver data as they are natively and therefore you are getting points. Data processing like generating contours from points is something for Web Processing Service (WPS). Read ...
I found it! Editting the model in the "Processing modelelr" window so the minimum contour value will include negative values (by default, the minimum level is st to 0). I still don't know what caused the error message I posted above, but it might just be a problem with the data set, cause the model works fine on other data sets.
there is a contour-plugin, which you can load via plugin-manager. additional infos here: https://github.com/ccrook/QGIS-Contour-Plugin
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