Navigate to your project directory:
e.g., cd E:\Project\Laravel\laravel-new-app

Install Composer dependencies:

composer install

*If composer install doesn't work or the vendor folder is still missing/incomplete
1. Clear Composer cache:

composer clear-cache

2. Delete vendor folder and composer.lock file (optional, but can help with fresh installs):

rm -rf vendor
rm composer.lock

3. Install the composer

composer install

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After completing these steps, the vendor folder and its contents, including autoload.php, should be present, resolving the error.

Even complete the above steps if you encounter this error->

Failed to download livewire/volt from dist: The zip extension and unzip/7z commands are both missing, skipping. The php.ini used by your command-line PHP is: C:\xampp\php\php.ini Now trying to download from source  

To resolve this issue,

1. Locate your php.ini file. The error message indicates it's at C:\xampp\php\php.ini if you are using XAMPP.

2. Open php.ini with a text editor.

3. Search for the line ;extension=zip.

4. Remove the semicolon (;) at the beginning of the line to uncomment it, making it extension=zip.

5. Save the php.ini file.

6. Restart the server

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After if you encounter this error->

Database file at path [E:\Project\Laravel\laravel-new-app\database\database.sqlite] does not exist. Ensure this is an absolute path to the database. (Connection: sqlite, SQL: select * from "sessions" where "id" = T9cQVcjhXc9StyBdsVuD9IkZpbdyD6BsCFYAPXz8 limit 1)

1. Go to your Laravel project’s database folder.
   E:\Project\Laravel\laravel-new-app\database

2. Create a new empty file called:
   database.sqlite

3. Run migrations:

   php artisan migrate