error message typo

Author: VeckoTheGecko

parcels/field.py

@@ -155,7 +155,7 @@ def __init__(
         if not isinstance(name, str):
             raise ValueError(f"Expected `name` to be a string, got {type(name)}.")
         if not isinstance(grid, (UxGrid, XGrid)):
-            raise ValueError(f"Expected `grid` to be a parcels UxGrid, or parcels Grid object, got {type(grid)}.")
+            raise ValueError(f"Expected `grid` to be a parcels UxGrid, or parcels XGrid object, got {type(grid)}.")
 
         assert_valid_mesh(mesh_type)