Added error message if only 2 args are passed in

Author: bhung-bdai

spatialmath/pose3d.py

@@ -976,6 +976,9 @@ def __init__(self, x=None, y=None, z=None, *, check=True):
             # SE3(x, y, z)
             self.data = [smb.transl(x, y, z)]
 
+        else:
+            raise ValueError("Invalid arguments. See documentation for correct format.")
+
     @staticmethod
     def _identity() -> NDArray:
         return np.eye(4)