Image file not readable

Symptoms

Sphinx build failed with the errors similar to:

WARNING: image file not readable: non-existing.png
WARNING: download file not readable: path/to/non-existing.zip

Reasons

Sphinx can’t find file at specified path.

Example

.. image:: non-existing.png

Or download :download:`non-existing.zip` file.

Solution

Ensure file at specified path really exist.