An exception was raised for seemingly no reason.

### Describe the bug At least a more specific message should be reported, and there are no lines in my repository mentioned. The log gave the same information that was displayed on the screen. ### How to Reproduce ``` make html ``` ### Environment Information ```text Platform: linux; (Linux-6.8.0-107-generic-x86_64-with-glibc2.39) Python version: 3.13.12 (main, Feb 4 2026, 09:25:39) [GCC 13.3.0]) Python implementation: CPython Sphinx version: 9.1.0 Docutils version: 0.21.2 Jinja2 version: 3.1.6 Pygments version: 2.19.1 ``` ### Sphinx extensions ```python ``` ### Additional context ``` Versions ======== * Platform: linux; (Linux-6.8.0-107-generic-x86_64-with-glibc2.39) * Python version: 3.13.12 (CPython) * Sphinx version: 9.1.0 * Docutils version: 0.21.2 * Jinja2 version: 3.1.6 * Pygments version: 2.19.1 Last Messages ============= None. Loaded Extensions ================= None. Traceback ========= File "/home/cnobile/.virtualenvs/nc3.13/lib/python3.13/site-packages/sphinx/application.py", line 217, in __init__ raise ApplicationError( __('Cannot find source directory (%s)') % self.srcdir ) sphinx.errors.ApplicationError: Cannot find source directory (/home/cnobile/src/GitHub/noncom-bookkeeper/docs/source) ```