03API 教程 Composer require dingo/API:^2.0.0-alpha2 一直报这个错 花了三四个钟了 求解

composer require dingo/api:^2.0.0-alpha2

*./composer.json has been updated
Loading composer repositories with package information
Updating dependencies (including require-dev)
Package operations: 4 installs, 0 updates, 0 removals
Installing league/fractal (0.17.0): Loading from cache
Installing doctrine/annotations (v1.6.0): Loading from cache
Installing dingo/blueprint (dev-master 76b1621): Cloning 76b162164f from cache
Installing dingo/api (v2.0.0-alpha2): Loading from cache
league/fractal suggests installing pagerfanta/pagerfanta (Pagerfanta Paginator)
league/fractal suggests installing zendframework/zend-paginator (Zend Framework Paginator)
dingo/api suggests installing tymon/jwt-auth (Protect your API with JSON Web Tokens.)
Writing lock file
Generating optimized autoload files
PHP Fatal error: Uncaught TypeError: Argument 1 passed to Composer\Autoload\ClassLoader::addClassMap() must be of the type array, integer given, called in phar:///usr/local/bin/composer/src/Composer/Autoload/AutoloadGenerator.php on line 760 and defined in phar:///usr/local/bin/composer/vendor/composer/ClassLoader.php:92
Stack trace:
0 phar:///usr/local/bin/composer/src/Composer/Autoload/AutoloadGenerator.php(760): Composer\Autoload\ClassLoader->addClassMap(1)
1 phar:///usr/local/bin/composer/src/Composer/Autoload/AutoloadGenerator.php(303): Composer\Autoload\AutoloadGenerator->getStaticFile('996eef7ea603f50...', '/home/vagrant/C...', '/home/vagrant/C...', '/home/vagrant/C...', 50600)
2 phar:///usr/local/bin/composer/src/Composer/Installer.php(303): Composer\Autoload\AutoloadGeneratordump(Object(Composer\Config), Object(Composer\Repository\InstalledFilesystemRepository), Object(Composer\Package\RootPackage), Object(Composer\Installer\InstallationManager), '/home/vagrant/C...', true)
3 phar:///usr/local/bin/composer/src/ in phar:///usr/local/bin/composer/vendor/composer/ClassLoader.php on line 92