When I tried to deploy My laravel app on heroku it can't be deployed and shows this error below I tried to solve this problem but I didn't catch any result

ERROR: Dependency installation failed! remote: ! remote: ! The 'composer install' process failed with an error. The cause remote: ! may be the download or installation of packages, or a pre- or remote: ! post-install hook (e.g. a 'post-install-cmd' item in 'scripts') remote: ! in your 'composer.json'. remote: ! remote: ! Typical error cases are out-of-date or missing parts of code, remote: ! timeouts when making external connections, or memory limits. remote: ! remote: ! Check the above error output closely to determine the cause of remote: ! the problem, ensure the code you're pushing is functioning remote: ! properly, and that all local changes are committed correctly. remote: ! remote: ! For more information on builds for PHP on Heroku, refer to remote: ! https://devcenter.heroku.com/articles/php-support remote: ! remote: ! REMINDER: the following warnings were emitted during the build; remote: ! check the details above, as they may be related to this error: remote: ! - An error occurred during a database connection or query remote: remote: ! Push rejected, failed to compile PHP app. remote: remote: ! Push failed remote: Verifying deploy... remote: enter code here remote: ! Push rejected to megotupe. remote: To https://git.heroku.com/megotupe.git ! [remote rejected] master -> master (pre-receive hook declined) error: failed to push some refs to 'https://git.heroku.com/megotupe.git'