Class CrossError

              object --+                    
                       |                    
exceptions.BaseException --+                
                           |                
        exceptions.Exception --+            
                               |            
        exceptions.StandardError --+        
                                   |        
               exceptions.ValueError --+    
                                       |    
                             _ValueError --+
                                           |
                                          CrossError

Error raised for zero or near-zero vectorial cross products, occurring for coincident or colinear points, lines or bearings.