Composer error

[ugintl]

When I run composer install, I get

Your requirements could not be resolved to an installable set of packages.

  Problem 1
    - Installation request for classpreloader/classpreloader 1.0.x-dev -> satisfiable by classpreloader/classpreloader[1.0.x-dev].
    - classpreloader/classpreloader 1.0.x-dev requires nikic/php-parser ~0.9 -> no matching package found.
  Problem 2
    - Installation request for classpreloader/classpreloader dev-master -> satisfiable by classpreloader/classpreloader[dev-master].
    - classpreloader/classpreloader dev-master requires nikic/php-parser ~0.9 -> no matching package found.
  Problem 3
    - Installation request for jeremeamia/superclosure 1.0.1 -> satisfiable by jeremeamia/SuperClosure[1.0.1].
    - jeremeamia/SuperClosure 1.0.1 requires nikic/php-parser ~0.9 -> no matching package found.
  Problem 4
    - classpreloader/classpreloader 1.0.x-dev requires nikic/php-parser ~0.9 -> no matching package found.
    - laravel/framework 4.1.x-dev requires classpreloader/classpreloader 1.0.* -> satisfiable by classpreloader/classpreloader[1.0.x-dev].
    - Installation request for laravel/framework 4.1.x-dev -> satisfiable by laravel/framework[4.1.x-dev].

Potential causes:
 - A typo in the package name
 - The package is not available in a stable-enough version according to your minimum-stability setting
   see <https://getcomposer.org/doc/04-schema.md#minimum-stability> for more details.
 - It's a private package and you forgot to add a custom repository to find it

When I run composer update I get

Warning: require(C:\laragon\www\madawa\bootstrap/../vendor/autoload.php): failed to open stream: No such file or directory in C:\laragon\www\madawa\bootstrap\autoload.php on line 17

Fatal error: require(): Failed opening required 'C:\laragon\www\madawa\bootstrap/../vendor/autoload.php' (include_path='.;C:/laragon/etc/php/pear') in C:\laragon\www\madawa\bootstrap\autoload.php on line 17
Script php artisan clear-compiled handling the pre-update-cmd event returned with error code 255