FileNotParsableError: "source/plugins/html5" file cannot be parsed

[MwumLi]

when * [HTML5](source/plugins/html5) in SUMMARY.md, gitbook serve will generate this error :

error: error while generating page "source/plugins/html5": FileNotParsableError: "source/plugins/html5" file cannot be parsed

I try to change 5 to word, no error
I try to change it to number, the error appears

It looks like the file name contain numbers can not be resolved gitbook-cli

gitbook version: 3.1.0 Systam : OS X EL Capitan

[MwumLi]

Solved!

I'm sorry for this ridiculous issue Cause of this error is that I wrote a few suffix .md
The correct wording is * [HTML5](source/plugins/html5.md

Sorry!!!