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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