Hi, Just to let you know in case you're desperately looking for a solution for this same problem... When running the "Topo To Raster" tool from Spatial Analyst, I continuously got the error "ERROR 010067: Error in executing grid expression." This was driving me crazy, as even the most simple dataset (no zero-length polygons) on a local drive in non-space directories didn't produce any results. In the end I could solve the error by changing my regional settings to "English (United States)" so that the decimal delimiter would be a dot "." instead of a comma ",". Now I can successfully use the tool... Strange but problem solved for now 😉 best regards tim
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