Magento 2: How to solve the error 500 in Web Setup Wizard when installing Amazon Pay? [closed]

I want to install Amazon-Pay in my Magento 2.1.0

But I can't open the [Component Manager] page.

I got the 500 error when I opened the page [Web Setup Wizard] and click to [Component Manager] page.

Additional information:

RuntimeException File: /var/www/setup/src/Magento/Setup/Model/PackagesData.php:88 Message: Couldn't get available versions for package shockwavemk/magento2-module-mail Stack trace: #0 /var/www/setup/src/Magento/Setup/Controller/ComponentGrid.php(98): Magento\Setup\Model\PackagesData->syncPackagesData() #1 /var/www/vendor/zendframework/zend-mvc/src/Controller/AbstractActionController.php(82): Magento\Setup\Controller\ComponentGrid->componentsAction() #2 [internal function]: Zend\Mvc\Controller\AbstractActionController->onDispatch(Object(Zend\Mvc\MvcEvent)) #3 /var/www/vendor/zendframework/zend-eventmanager/src/EventManager.php(444): call_user_func(Array, Object(Zend\Mvc\MvcEvent)) #4 /var/www/vendor/zendframework/zend-eventmanager/src/EventManager.php(205): Zend\EventManager\EventManager->triggerListeners('dispatch', Object(Zend\Mvc\MvcEvent), Object(Closure)) #5 /var/www/vendor/zendframework/zend-mvc/src/Controller/AbstractController.php(118): Zend\EventManager\EventManager->trigger('dispatch', Object(Zend\Mvc\MvcEvent), Object(Closure)) #6 /var/www/vendor/zendframework/zend-mvc/src/DispatchListener.php(93): Zend\Mvc\Controller\AbstractController->dispatch(Object(Zend\Http\PhpEnvironment\Request), Object(Zend\Http\PhpEnvironment\Response)) #7 [internal function]: Zend\Mvc\DispatchListener->onDispatch(Object(Zend\Mvc\MvcEvent)) #8 /var/www/vendor/zendframework/zend-eventmanager/src/EventManager.php(444): call_user_func(Array, Object(Zend\Mvc\MvcEvent)) #9 /var/www/vendor/zendframework/zend-eventmanager/src/EventManager.php(205): Zend\EventManager\EventManager->triggerListeners('dispatch', Object(Zend\Mvc\MvcEvent), Object(Closure)) #10 /var/www/vendor/zendframework/zend-mvc/src/Application.php(314): Zend\EventManager\EventManager->trigger('dispatch', Object(Zend\Mvc\MvcEvent), Object(Closure)) #11 /var/www/setup/index.php(31): Zend\Mvc\Application->run() #12 {main} 

Any ideas? Pls help, thanks!