在第17行的/bootstrap/autoload.php中打开所需的'/bootstrap/../vendor/autoload.php'（include_path ='。：/ usr / share / php'）失败

Question

I have checked out laravel project from this svn repo. Now I get this error when I run php artisan serve composer update or composer install commands

Script php artisan clear-compiled handling the pre-update-cmd event returned with an error

  [RuntimeException]                                                           
  Error Output: PHP Warning:  require(/osmall/trunk/bootstrap/../vendor/autoload.php): failed to open stream: No such file or directory in /trunk/bootstrap/autoload.php on line 17         
  PHP Fatal error:  require(): Failed opening required '/osmall/trunk/bootstrap/../vendor/autoload.php'(include_path='.:/usr/share/php') in /osmall/trunk/bootstrap/autoload.php on line 17 

I get an additional message with the above one if I run php composer.phar install command

Script php artisan clear-compiled handling the pre-update-cmd event returned with error code 255

If i do composer dump-autoload -o and then run update or install commands then

Script php artisan clear-compiled handling the pre-update-cmd event returned with an error




[RuntimeException]                                                           
  Error Output: PHP Fatal error:  Uncaught Error: Class 'Illuminate\Foundation\Application' not found in /osmall/trunk/bootstrap/app.php:14                                                                         
  Stack trace:                                                                 
  #0 /osmall/trunk/artisan(18): require_once()                
  #1 {main}                                                                    
    thrown in /osmall/trunk/bootstrap/app.php on line 14

Additional Information
1. My composer version is 1.0.0-beta2
2. I have both php 5.6 and 7 installed.
3. I am running ubuntu

Can somebody help me please.