Page build failed for the master branch with the following error: You have an error on line 14 of your _config.yml file.

[yosemitefalls]

https://github.com/yosemitefalls/yosemitefalls.github.io

howdy, I'm getting this error after pushing my changes. I followed the remote instructions and can't understand what's going wrong here.
any help would be appreciated, thank you

[mmistakes]

I do not recommend forking this repo to install, even if doing so using as a remote theme. There are many files you do not need that will end up giving you issues.

Instead fork this starter repo.
https://github.com/mmistakes/mm-github-pages-starter/generate

[mmistakes]

Also when I cloned your repo and built it locally I get the same error. Starting with a clean _config.yml it built fine. Not sure what the issue is but there's something in the YAML file perhaps that is causing a problem. Could be an improper indent or invalid character somewhere.

YAML is extremely unforgiving. Try running it through a YAML linter tool like http://www.yamllint.com/

My guess is there's something after line 14 that is invalid because if you remove all the lines after it, it passes.

[mmistakes]

Think these lines are your problem. The indentation is all wrong.
https://github.com/yosemitefalls/yosemitefalls.github.io/blob/master/_config.yml#L283-L288