Code errors

[rbaroncpd]

Hi all,
I am new here so please forgive me if I don't answer or even ask the question correctly...

So I am using Ruby, Git Bash and Visual Studio Code to create my web pages. Everything was going good until I shut down my computer.

When I came back to my project I wanted to have "jekyll serve" my pages. Instead I got this error:

Rich@Rich-PC MINGW64 /c/users/rich/desktop/Business-Site-in-Bootstrap-4/project1
$ node -v; npm -v; bower -v
v6.11.2
3.10.10
1.8.0

Rich@Rich-PC MINGW64 /c/users/rich/desktop/Business-Site-in-Bootstrap-4/project1
$ code about-us.html

Rich@Rich-PC MINGW64 /c/users/rich/desktop/Business-Site-in-Bootstrap-4/project1
$ jekyll serve
Configuration file: C:/users/rich/desktop/Business-Site-in-Bootstrap-4/project1/_config.yml
Source: C:/users/rich/desktop/Business-Site-in-Bootstrap-4/project1
Destination: C:/users/rich/desktop/Business-Site-in-Bootstrap-4/project1/_site
Incremental build: disabled. Enable with --incremental
Generating...
Liquid Exception: Liquid syntax error (line 3): Unknown tag 'Include' in about-us.html
jekyll 3.5.2 | Error: Liquid syntax error (line 3): Unknown tag 'Include'

On line 3 on the "about-us.html" page is: --- Line 1 also has: --- with "layout: default" on Line2.

I don't know how to fix it.

Thanks in advance.....