better error message

Author: tomvanmele

src/compas/geometry/surfaces/nurbs.py

@@ -182,7 +182,7 @@ def __from_data__(cls, data):
 
     def __new__(cls, *args, **kwargs):
         if cls is NurbsSurface:
-            raise TypeError("Instantiating the base NURBS Surface class directly is not allowed.")
+            raise TypeError("Making an instance of `NurbsSurface` using `NurbsSurface()` is not allowed. Please use one of the factory methods instead (`NurbsSurface.from_...`)")
         return object.__new__(cls)
 
     def __repr__(self):

src/compas/geometry/surfaces/surface.py

@@ -46,7 +46,7 @@ class Surface(Geometry):
 
     def __new__(cls, *args, **kwargs):
         if cls is Surface:
-            raise TypeError("Instantiating the base Surface class directly is not allowed.")
+            raise TypeError("Making an instance of `Surface` using `Surface()` is not allowed. Please use one of the factory methods instead (`Surface.from_...`)")
         return object.__new__(cls)
 
     def __init__(self, frame=None, name=None):