Solution:1
Run composer with –no-scripts
composer update --no-scripts
This shall fix the issue. I tried this on Mac and Linux.
Solution:2
Which OS you are using ? For Windows : Go to Command Prompt
set path to www/{ur project}
For me : www/laravel5
Then type this command : composer install
It will automatically install all dependency in vendor/
Solution:3
Did you create a new project or did you clone an existing project?
If you cloned an existing project it’s very important to run
composer install
That way all the dependencies that are missing will be installed.
But if you create a new project you should run this command to make a new project using composer
composer create-project laravel/laravel name-of-your-project