TypeError: object of type 'NoneType' has no len() #193
Description
Hello! I'm having trouble using Excalibur out of the box.
What I did
Installed Excalibur and set it up:
pip install excalibur-py excalibur initdb excalibur webserver Then, uploaded a PDF via the web interface.
Expected behavior
Excalibur extracts data from my PDF for me.
Actual behavior
I receive a 500 Internal Server Error at http://localhost:5000/workspaces/c644cced-85fe-42a7-92c9-aa6dcc6fc72a:
❯ excalibur webserver * Serving Flask app 'excalibur.www.app' * Debug mode: off WARNING: This is a development server. Do not use it in a production deployment. Use a production WSGI server instead. * Running on http://127.0.0.1:5000 Press CTRL+C to quit 127.0.0.1 - - [08/Jan/2025 11:40:05] "GET / HTTP/1.1" 302 - 127.0.0.1 - - [08/Jan/2025 11:40:05] "GET /files HTTP/1.1" 200 - 127.0.0.1 - - [08/Jan/2025 11:40:05] "GET /static/css/vendor/bootstrap.min.css HTTP/1.1" 200 - 127.0.0.1 - - [08/Jan/2025 11:40:05] "GET /static/js/vendor/jquery-3.3.1.min.js HTTP/1.1" 200 - 127.0.0.1 - - [08/Jan/2025 11:40:05] "GET /static/css/base.css HTTP/1.1" 200 - 127.0.0.1 - - [08/Jan/2025 11:40:05] "GET /static/js/vendor/popper.min.js HTTP/1.1" 200 - 127.0.0.1 - - [08/Jan/2025 11:40:05] "GET /static/js/vendor/bootstrap.min.js HTTP/1.1" 200 - 127.0.0.1 - - [08/Jan/2025 11:40:05] "GET /static/js/files.js HTTP/1.1" 200 - 127.0.0.1 - - [08/Jan/2025 11:40:05] "GET /static/favicon.ico HTTP/1.1" 200 - 127.0.0.1 - - [08/Jan/2025 11:40:12] "POST /files HTTP/1.1" 200 - [2025-01-08 11:40:12,401] ERROR in app: Exception on /workspaces/c644cced-85fe-42a7-92c9-aa6dcc6fc72a [GET] Traceback (most recent call last): File "/Users/mplewis/.local/share/mise/installs/python/3.12.7/lib/python3.12/site-packages/flask/app.py", line 1511, in wsgi_app response = self.full_dispatch_request() ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/Users/mplewis/.local/share/mise/installs/python/3.12.7/lib/python3.12/site-packages/flask/app.py", line 919, in full_dispatch_request rv = self.handle_user_exception(e) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/Users/mplewis/.local/share/mise/installs/python/3.12.7/lib/python3.12/site-packages/flask/app.py", line 917, in full_dispatch_request rv = self.dispatch_request() ^^^^^^^^^^^^^^^^^^^^^^^ File "/Users/mplewis/.local/share/mise/installs/python/3.12.7/lib/python3.12/site-packages/flask/app.py", line 902, in dispatch_request return self.ensure_sync(self.view_functions[rule.endpoint])(**view_args) # type: ignore[no-any-return] ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/Users/mplewis/.local/share/mise/installs/python/3.12.7/lib/python3.12/site-packages/excalibur/www/views.py", line 106, in workspaces return render_template( ^^^^^^^^^^^^^^^^ File "/Users/mplewis/.local/share/mise/installs/python/3.12.7/lib/python3.12/site-packages/flask/templating.py", line 150, in render_template return _render(app, template, context) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/Users/mplewis/.local/share/mise/installs/python/3.12.7/lib/python3.12/site-packages/flask/templating.py", line 131, in _render rv = template.render(context) ^^^^^^^^^^^^^^^^^^^^^^^^ File "/Users/mplewis/.local/share/mise/installs/python/3.12.7/lib/python3.12/site-packages/jinja2/environment.py", line 1295, in render self.environment.handle_exception() File "/Users/mplewis/.local/share/mise/installs/python/3.12.7/lib/python3.12/site-packages/jinja2/environment.py", line 942, in handle_exception raise rewrite_traceback_stack(source=source) File "/Users/mplewis/.local/share/mise/installs/python/3.12.7/lib/python3.12/site-packages/excalibur/www/templates/workspace.html", line 1, in top-level template code {% extends "base.html" %} File "/Users/mplewis/.local/share/mise/installs/python/3.12.7/lib/python3.12/site-packages/excalibur/www/templates/base.html", line 61, in top-level template code {% block workspace %}{% endblock %} ^^^^^^^^^^^^^^^^^^^^^^^^^ File "/Users/mplewis/.local/share/mise/installs/python/3.12.7/lib/python3.12/site-packages/excalibur/www/templates/workspace.html", line 12, in block 'workspace' {% if imagepaths is not none or imagepaths|length == 0 %} ^^^^^^^^^^^^^^^^^^^^^^^^^ TypeError: object of type 'NoneType' has no len() 127.0.0.1 - - [08/Jan/2025 11:40:12] "GET /workspaces/c644cced-85fe-42a7-92c9-aa6dcc6fc72a HTTP/1.1" 500 -Versions
>>> import platform; print(platform.platform()) macOS-15.2-arm64-arm-64bit >>> import sys; print('Python', sys.version) Python 3.12.7 (main, Oct 2 2024, 15:45:55) [Clang 18.1.8 ] >>> import numpy; print('NumPy', numpy.__version__) NumPy 2.2.1 >>> import cv2; print('OpenCV', cv2.__version__) OpenCV 4.10.0 >>> import excalibur; print('Excalibur', excalibur.__version__) Excalibur 1.0.1 Let me know if I can provide any more info to help you replicate this issue. Thanks!