Application Error on new site

I am new to closing, and I made a free website: http://albumoftheweekclub.000webhostapp.com

When I try to load it, I get an “application error”. I tried to add a line of code in .htaccess to have the site start at index.html. Maybe this is the problem?

Yep bad .htaccess will cause that.
Empty that file out and start again.