Heroku でデプロイ後４０４エラーがでてしまいます。。

2020-10-06T04:51:50.967886+00:00 heroku[router]: at=info method=POST path="/Edit_study.php" host=munakatatest8.herokuapp.com request_id=8e3756a5-4714-4271-b932-88d79f1306c6 fwd="1.75.231.68" dyno=web.1 connect=1ms service=282ms status=302 bytes=12375 protocol=https
2020-10-06T04:51:50.968087+00:00 app[web.1]: 10.69.229.158 - - [06/Oct/2020:04:51:50 +0000] "POST /Edit_study.php HTTP/1.1" 302 11995 "https://munakatatest8.herokuapp.com/Edit_study.php" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/85.0.4183.121 Safari/537.36
2020-10-06T04:51:51.213424+00:00 app[web.1]: 10.69.229.158 - - [06/Oct/2020:04:51:51 +0000] "GET /Readback.php HTTP/1.1" 404 196 "https://munakatatest8.herokuapp.com/Edit_study.php" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/85.0.4183.121 Safari/537.36
2020-10-06T04:51:51.213416+00:00 heroku[router]: at=info method=GET path="/Readback.php" host=munakatatest8.herokuapp.com request_id=2bcd101c-0660-4fb0-baec-536961f88f63 fwd="1.75.231.68" dyno=web.1 connect=1ms service=2ms status=404 bytes=360 protocol=https

ApplenoMacBook-Air:deploytest2 ymunakata$ git push heroku master
Enumerating objects: 7, done.
Counting objects: 100% (7/7), done.
Delta compression using up to 4 threads
Compressing objects: 100% (4/4), done.
Writing objects: 100% (4/4), 424 bytes | 424.00 KiB/s, done.
Total 4 (delta 2), reused 0 (delta 0)
remote: Compressing source files... done.
remote: Building source:
remote: 
remote: -----> PHP app detected
remote: -----> Bootstrapping...
remote: 
remote:  !     WARNING: Your 'composer.lock' is out of date!
remote:  !     
remote:  !     The 'composer.lock' file in your project is not up to date with
remote:  !     the main 'composer.json' file. This may result in installation
remote:  !     of incorrect packages or package versions.
remote:  !     
remote:  !     The lock file is required in order to guarantee reliable and
remote:  !     reproducible installation of dependencies across systems and
remote:  !     deploys. It must always be kept in sync with 'composer.json'.
remote:  !     
remote:  !     Whenever you change 'composer.json', ensure that you perform
remote:  !     the following steps locally on your computer:
remote:  !     1) run 'composer update'
remote:  !     2) add all changes using 'git add composer.json composer.lock'
remote:  !     3) commit using 'git commit'
remote:  !     
remote:  !     Ensure that you updated the lock file correctly, and that you
remote:  !     ran 'git add' on both files, before deploying again.
remote:  !     
remote:  !     Please remember to always keep your 'composer.lock' updated in
remote:  !     lockstep with 'composer.json' to avoid common problems related
remote:  !     to dependencies during collaboration and deployment.
remote:  !     
remote:  !     Please refer to the Composer documentation for further details:
remote:  !     https://getcomposer.org/doc/
remote:  !     https://getcomposer.org/doc/01-basic-usage.md
remote: 
remote: -----> Installing platform packages...
remote:        - php (7.3.23)
remote:        - ext-mbstring (bundled with php)
remote:        - apache (2.4.46)
remote:        - nginx (1.18.0)
remote: 
remote:  !     WARNING: Your app's PHP version is close to end of maintenance
remote:  !     
remote:  !     Only security updates will be provided for your PHP version
remote:  !     series by the PHP Group as of 2020-12-06.
remote:  !     
remote:  !     It is strongly recommended you update your app to a version of
remote:  !     PHP with "active support" status immediately to ensure you get
remote:  !     the latest bugfixes and security updates each time you deploy.
remote:  !     
remote:  !     You may check the list of versions supported by the PHP Group
remote:  !     and their EOL dates here: http://php.net/supported-versions.php
remote:  !     
remote:  !     For a list of supported runtimes & extensions on Heroku, please
remote:  !     refer to: https://devcenter.heroku.com/articles/php-support
remote: 
remote: -----> Installing dependencies...
remote:        Composer version 1.10.13 2020-09-09 11:46:34
remote: 
remote:  !     WARNING: Composer vendor dir found in project!
remote:  !     
remote:  !     Your Git repository contains Composer's 'vendor' directory.
remote:  !     
remote:  !     This directory should not be under version control; only your
remote:  !     'composer.json' and 'composer.lock' files need to be added, as
remote:  !     Composer will handle installation of dependencies on deploy.
remote:  !     
remote:  !     To suppress this notice, first remove the folder from the index
remote:  !     by running 'git rm -r --cached vendor/'.
remote:  !     Next, edit your project's '.gitignore' file and add the folder
remote:  !     '/vendor/' to the list, then commit the changes.
remote:  !     
remote:  !     For more info, refer to the Composer FAQ: http://bit.ly/1rlCSZU
remote: 
remote:        Loading composer repositories with package information
remote:        Installing dependencies from lock file
remote:        Warning: The lock file is not up to date with the latest changes in composer.json. You may be getting outdated dependencies. It is recommended that you run `composer update` or `composer update <package name>`.
remote:        Nothing to install or update
remote:        Generating optimized autoload files
remote: -----> Preparing runtime environment...
remote:        NOTICE: No Procfile, using 'web: heroku-php-apache2'.
remote: -----> Checking for additional extensions to install...
remote: -----> Discovering process types
remote:        Procfile declares types -> web
remote: 
remote: -----> Compressing...
remote:        Done: 14.8M
remote: -----> Launching...
remote:        Released v9
remote:        https://munakatatest8.herokuapp.com/ deployed to Heroku
remote: 
remote: Verifying deploy... done.
To https://git.heroku.com/munakatatest8.git
   99381dc..345043a  master -> master