Why my project is 404

Hi
I deployed my project from git
and when I click to visit my web site on netlify I see 404 error
what can I do?
This is link
https://travelappwithsass.netlify.app/

Do you have an index.html for your project?

Yes
In my project i have index.html

Can we have a link to the repo?

@AmirHosein Welcome to the Netlify community.

Do you have an index.html file at the top level of your site files? In other words, not in a sub-folder named /build/ or some such?

If you can’t figure out what’s going on, you can download a copy of your deploy and see where the files are.

yes here you are

thanks for the answer to my question
I can fix the error last deploy but now I have a new error
Error:
Error checking out submodules: fatal: No url found for submodule path ‘sass’ in .gitmodules

Hi, @AmirHosein. This is an error with your repo itself. To reproduce the error do the following:

$ mkdir new-empty-directory
$ cd new-empty-directory/
$ git clone https://github.com/amirhoseinmoghaddasi/Travel
Cloning into 'Travel'...
remote: Enumerating objects: 3498, done.
remote: Counting objects: 100% (3498/3498), done.
remote: Compressing objects: 100% (2630/2630), done.
remote: Total 3498 (delta 632), reused 3498 (delta 632), pack-reused 0
Receiving objects: 100% (3498/3498), 25.93 MiB | 28.16 MiB/s, done.
Resolving deltas: 100% (632/632), done.
$ cd Travel/
$ git submodule update -f --init
fatal: No url found for submodule path 'sass' in .gitmodules

Because the error isn’t specific to Netlify, our support team won’t have the bandwidth to assist with this. However, the question is still welcome on this community site and someone else here might be able to troubleshoot this issue with you.