diff --git a/Web/Python/CMakeLists.txt b/Web/Python/CMakeLists.txt
index a8d0f85b183dbcdc95dece0fd93d2f14a53b8b1b..5254e772dfffba0f7c332c24ab75dc89c63fab4a 100644
--- a/Web/Python/CMakeLists.txt
+++ b/Web/Python/CMakeLists.txt
@@ -2,6 +2,7 @@ set(files
   vtkmodules/web/__init__.py
   vtkmodules/web/camera.py
   vtkmodules/web/dataset_builder.py
+  vtkmodules/web/errors.py
   vtkmodules/web/protocols.py
   vtkmodules/web/query_data_model.py
   vtkmodules/web/render_window_serializer.py