I'm new on qgis, when I open a shapefile this error appear:
File "C:/PROGRA~1/QGIS2~1.18/apps/qgis/./python/plugins\processing\gui\GeometryPredicateSelectionPanel.py", line 81, in onRightLayerChange
self.updatePredicates()
File "C:/PROGRA~1/QGIS2~1.18/apps/qgis/./python/plugins\processing\gui\GeometryPredicateSelectionPanel.py", line 88, in updatePredicates
unusablePredicates = self.unusablePredicates[leftType][rightType]
KeyError: 3
What means?