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When i use in QGIS 3.6 TrainImagesClassifier i obtain an error on vector file class :
parameter io.vd is expecting a filename.
In the photo given by you, I can see a specific value for io.vd.
Also please include below informations:
OS Platform: Windows?
Mode of installation: OSGeo4W/build/other..
QGIS version: ?
Required, but never shown