Deleted the cast error in class TOP

mobject/mobject.py

@@ -121,6 +121,7 @@ class Mobject(object):
     def shift(self, *vectors):
         total_vector = reduce(op.add, vectors)
         for mob in self.family_members_with_points():
+           mob.points = mob.points.astype('float')
            mob.points += total_vector
         return self
 
@@ -705,16 +706,3 @@ class Group(Mobject):
     #the mobject is used primarily for its submobject housing
     #functionality.
     pass
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