Answers for "failed to open stream: No such file or directory in artisan on line 18"

failed to open stream: No such file or directory in artisan on line 18

The error is due to missing vendor folder.
You just need to run `composer install` in the project directory which will 
create a folder named vendor which will have all composer libraries and 
`autoload.php` file.

failed to open stream: no such file or directory php

There are many reasons why one might run into this error and thus a good checklist of what to check first helps considerably.

Let's consider that we are troubleshooting the following line:

require "/path/to/file"

failed to open stream: No such file or directory in artisan on line 18

The error is caused due outdated composer, hence the solution is 
to install or update composer in project directory and 
also install or update npm in the project the create the .env file with no example file format type. 
The run php artisan commands again.