TypeError: Cannot read property 'text' of undefined

[MarcoHengstenberg]

I have no idea what to make out of this error message.

I have installed Gitbook a few weeks ago and have recently started to create a book. Now, all out of a sudden, it refrains from doing the gitbook serve task by telling me "TypeError: Cannot read property 'text' of undefined".

I just did the npm install gitbook -g command again to get the current version of Gitbook. Now, when doing the gitbook serve task the following output is given:

Starting build ...
TypeError: Cannot read property 'text' of undefined
at parseChapter (/usr/local/lib/node_modules/gitbook/lib/parse/summary.js:94:46)
at Function.map (/usr/local/lib/node_modules/gitbook/node_modules/lodash/dist/lodash.js:3508:27)
at lodash.ctor.(anonymous function) as map
at Object.parseSummary as summary
at /usr/local/lib/node_modules/gitbook/lib/generate/index.js:125:45
at _fulfilled (/usr/local/lib/node_modules/gitbook/node_modules/q/q.js:787:54)
at self.promiseDispatch.done (/usr/local/lib/node_modules/gitbook/node_modules/q/q.js:816:30)
at Promise.promise.promiseDispatch (/usr/local/lib/node_modules/gitbook/node_modules/q/q.js:749:13)
at /usr/local/lib/node_modules/gitbook/node_modules/q/q.js:557:44
at flush (/usr/local/lib/node_modules/gitbook/node_modules/q/q.js:108:17)

[SamyPesse]

Can you give me the content of your SUMMARY.md please

[MarcoHengstenberg]

# Summary

- [The Setup](the-setup/README.md)
  - [Dependencies](the-setup/dependencies.md)
  - [The Installation](the-setup/the-installation.md)

- [The Project](the-project/README.md)
  - [Project Files](the-project/project-files.md)
  - [About The Project](the-project/project-theme.md)

[SamyPesse]

Can you try removing the line between the two lists and let me know if that works?

@AaronO do you have any idea why this error is happing?

[MarcoHengstenberg]

The empty line was the problem indeed.
Why is that?

However, issue closed and a huge thanks! =)

[SamyPesse]

The empty line was creating two list in the summary and not just one, it should not raised an error but just ignore the second list.

@AaronO wrote this code, so I'll just let him take a look at this.

[iredmail]

It turns out this is the most common issue while building book, please help fix it ASAP.

[SamyPesse]

Did you look at the solution below ?

[jicksta]

I ran into this as well. Was kinda surprised it was just a formatting issue. Some warning would be nice. This is an error that many folks who are wanting to try gitbook will bump into literally on their first execution of the gitbook command. Thanks for the work on gitbook btw!

[oubiwann]

This one just bit me as well. Couldn't figure out why the new book wasn't building. This is my third gitbook, and I wanted to try a deeper content structure ...