Lavarel - Error while running php artisan - with MAMP PRO

First steps with Laravel 5 on MacOSX running MAMP PRO stack.

php artisan 

I got the following error:

[RuntimeException]
Error Output: PHP Warning: require(/Users/../../bootstrap/../vendor/autoload.php): failed to open stream: No such file or directory in /Users/../../bootstrap/autoload.php on line 17
PHP Fatal error: require(): Failed opening required '/Users/../../bootstrap/../vendor/autoload.php' (include_p
ath='.:/Applications/MAMP/bin/php/php5.6.10/lib/php') in /Users/../../bootstrap/autoload.php on line 17

It seems to be related with some bootstrap autoload and MAMP php binaries... But this is as far as I can understand this.

Can I have some advices please?

If I run composer update instead, I do get the same Fatal Error.

via Chebli Mohamed