Here's the complete output if you include <latex-image> in a PreTeXt slides document (except for the bit about the project being ready for 2.0):
PreTeXt project found in `/home/sean/Documents/Teaching/Fall2023/Math1560/Activities`.
Note: No webwork elements found.
Traceback (most recent call last):
File "/home/sean/.local/bin/pretext", line 8, in <module>
sys.exit(main())
^^^^^^
File "/home/sean/.local/pipx/venvs/pretext/lib/python3.11/site-packages/click/core.py", line 1157, in __call__
return self.main(*args, **kwargs)
^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/sean/.local/pipx/venvs/pretext/lib/python3.11/site-packages/click/core.py", line 1078, in main
rv = self.invoke(ctx)
^^^^^^^^^^^^^^^^
File "/home/sean/.local/pipx/venvs/pretext/lib/python3.11/site-packages/click/core.py", line 1688, in invoke
return _process_result(sub_ctx.command.invoke(sub_ctx))
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/sean/.local/pipx/venvs/pretext/lib/python3.11/site-packages/click/core.py", line 1434, in invoke
return ctx.invoke(self.callback, **ctx.params)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/sean/.local/pipx/venvs/pretext/lib/python3.11/site-packages/click/core.py", line 783, in invoke
return __callback(*args, **kwargs)
^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/sean/.local/pipx/venvs/pretext/lib/python3.11/site-packages/pretext/cli.py", line 451, in build
project.generate(
target.name(), asset_list=[asset])
File "/home/sean/.local/pipx/venvs/pretext/lib/python3.11/site-packages/pretext/project/__init__.py", line 536, in generate
generate.latex_image(
File "/home/sean/.local/pipx/venvs/pretext/lib/python3.11/site-packages/pretext/generate.py", line 46, in latex_image
and formats[target_format] != []
~~~~~~~^^^^^^^^^^^^^^^
KeyError: 'custom'