I took esmi’s advice and contacted my host. Here’s the solution that I got from them:
I had to upload the theme through the Bluehost File Manager.
I’m a complete noob, so sorry if this is common sense or simple to other people – hopefully this can help out other noobs like myself who encounter this problem for the first time.
I removed Jetpack, Mojo Marketplace, and Hello Dolly, and now I’m able to access that page and that error message no longer shows up. However, when I try to upload a theme (Optimize Press), it seems to time out and I get this page:
“Are you sure you want to do this?
Please try again.”
If I click please try again, nothing happens, it just takes me back to the same screen.
