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@pengyuehaha What values did you provide on destination and source input prompts?
I put C:\Book1 and C:\OSS\Spark\content. And the markdown files and notebooks are all under C:\OSS\Spark\content
Can you open Manage Packages (the last icon the notebook toolbar located at the top right corner) and in your installed packages list, can you scroll and check the version of jupyter-book installed.
It is 0.7.0
Ah, this is almost certainly because jupyter-book 0.7.0 has a breaking change with the folder structure, which we don't support yet. @MaddyDev can we change the notebook to ensure that version 0.6.4 is installed on users' machines?
As an alternative until we roll our changes to fix this, Please make sure to install jupyter-book version <= 0.6.4 before running/using this notebook to create a book. (You can install using the manage packages and selecting the version 0.6.4)