403 Forbidden Error Nginx when Piloting--can't find a way to fix it

URL of experiment:

Description of the problem:
To whom it may concern,

I have been trying to pilot my experiment for pretty much my entire day today and every time I get a 403 Forbidden Error Nginx. I have tried so many different ways of clearing this out–clearing caches & history, making an SSH key, and trying to change permissions of my files among many other coding type things that I cannot even describe. I tried using chmod commands to change permissions of my experiment but that did not seem to work. I am really not sure what I am doing wrong. If anyone has any guaranteed methods for fixing this, please let me know.

Thank you

Did you ever figure out what the issue was? I am having the exact same problem.