Date: 29-Oct-19 11:20:17
An error occurred in CALCULATING TERRAINS
The operation is fully aborted

undefined method `z' for nil:NilClass
 
toposhaperalgo.rbe: 2423 -- block in altitude_at_point
toposhaperalgo.rbe: 2417 -- each
toposhaperalgo.rbe: 2417 -- altitude_at_point
toposhaperalgo.rbe: 2390 -- altitude_multi
toposhaperalgo.rbe: 427 -- block in top_processing
toposhaperalgo.rbe: 425 -- each
toposhaperalgo.rbe: 425 -- each_with_index
toposhaperalgo.rbe: 425 -- top_processing
toposhapertool.rbe: 574 -- algo_processing
toposhapertool.rbe: 666 -- execute_validate
toposhaperpalette.rbe: 130 -- execute_from_palette
toposhaperpalette.rbe: 76 -- notify_from_palette
toposhaperpalette.rbe: 518 -- call
toposhaperpalette.rbe: 518 -- block (2 levels) in palette_validate
body_lib6palette.rbe: 3966 -- execute_button
body_lib6palette.rbe: 3768 -- onLButtonUp
lib6palette.rbe: 97 -- onLButtonUp
toposhapertool.rbe: 984 -- onLButtonUp