I'm using 2.8.1 QGIS version (Wien) and I have a raster layer with FWI values and a vector with district polygons. What I wnat is to calculate the mean pixer FWI value per district. I know the Zonal Statistics funtion, but when I use her appears this error: "Algorithm Zonal Statistics starting...'NoneType' object has no attribute 'exportToWkt' See log for more details". I don´t know what could be the problem. I'm using the same CRS layers. Any help?
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