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I'm building a model where, among other things, I use r.watershed, from which I only keep the "stream segments" output.

In addition I would like to convert that raster to vector lines. When I do that manually, I normally use the r.to.vect algorithm and it works fine. But when I try adding that last algorithm to my model, I get the following error:

Traceback (most recent call last): File "C:/PROGRA~1/QGIS3~1.2/apps/qgis/./python/plugins\processing\algs\grass7\Grass7Algorithm.py", line 400, in processAlgorithm getattr(self, fullName)(parameters, context, feedback) File "C:/PROGRA~1/QGIS3~1.2/apps/qgis/./python/plugins\processing\algs\grass7\Grass7Algorithm.py", line 452, in processInputs paramName, parameters, context) File "C:/PROGRA~1/QGIS3~1.2/apps/qgis/./python/plugins\processing\algs\grass7\Grass7Algorithm.py", line 690, in loadRasterLayerFromParameter self.loadRasterLayer(name, layer, external, band) File "C:/PROGRA~1/QGIS3~1.2/apps/qgis/./python/plugins\processing\algs\grass7\Grass7Algorithm.py", line 709, in loadRasterLayer os.path.normpath(layer.source()), AttributeError: 'NoneType' object has no attribute 'source'

What's wrong with this code?

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