tensorflow.python.framework.errors_impl.NotFoundError: ./Checkpoint/pre-recommender; No such file or directory [[{{node save/SaveV2}}]]

This error message suggests that the file or directory specified in the TensorFlow code cannot be found. Specifically, the file or directory "./Checkpoint/pre-recommender" could not be found.

This could be due to a few reasons:

- The file or directory was deleted or moved from the specified location.
- There is a typo or mistake in the file or directory name.
- The file or directory was never created in the first place.

To resolve this error, you can try the following steps:

- Check that the file or directory exists in the specified location.
- Double-check the spelling and syntax of the file or directory name.
- Make sure the file or directory is created before you try to access it in the code.
- If the file or directory was moved, update the code to reflect the new location.
- If the file or directory was deleted, recreate it or modify the code to handle this scenario.