I'm having issues with an internal server error when I try to create a new static page for my website.

I'm doing the following steps:
1. create the file and save as filename.html
2. using FTP, upload the file to the same directory where my other flat pages are stored
3. try accessing the page from my website, and I get the error

Permissions are the same for all the flat pages. I feel like I'm missing a basic step, but can't figure out what it is.

Please help!

Thanks