安装后就报这个错，怎么解
Fatal error: Uncaught Error: Class 'think\Route' not found in D:\phpStudy\WWW\chedai-ba
se\vendor\topthink\think-captcha\src\helper.php:12 Stack trace: #0 D:\phpStudy\WWW\chedai-base\thinkphp\library\think\Loader.php(676): require() #1 D:\phpStudy\WWW\chedai-base\thinkphp\library\think\Loader.php(361): think\__require_file('D:\\phpStudy\\WWW...') #2 D:\phpStudy\WWW\chedai-base\thinkphp\library\think\Loader.php(317): think\Loader::loadComposerAutoloadFiles() #3 D:\phpStudy\WWW\chedai-base\thinkphp\base.php(59): think\Loader::register() #4 D:\phpStudy\WWW\chedai-base\thinkphp\start.php(16): require('D:\\phpStudy\\WWW...') #5 D:\phpStudy\WWW\chedai-base\web\index.php(5): require('D:\\phpStudy\\WWW...') #6 {main} thrown in D:\phpStudy\WWW\chedai-base\vendor\topthink\think-captcha\src\helper.php on line 12
