Couldn't find table of content file. To auto-generate one, run:

[aatizghimire]

Describe the bug

Reproduce the bug

1. create jb through: $ jb create mynewbook
2. build: $ jb build mynewbook

List your environment

Jupyter Book : 1.0.0 External ToC : 1.0.1 MyST-Parser : 2.0.0 MyST-NB : 1.0.0 Sphinx Book Theme : 1.1.0 Jupyter-Cache : 1.0.0 NbClient : 0.9.0

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