报错提示：
Warning: require(F:\phpstudy_pro\xyn\heyangtang-crm\vendor\composer/../symfony/deprecation-contracts/function.php): failed to open stream: No such file or directory in F:\phpstudy_pro\xyn\heyangtang-crm\thinkphp\library\think\Loader.php on line 676
Fatal error: require(): Failed opening required ‘F:\phpstudy_pro\xyn\heyangtang-crm\vendor\composer/../symfony/deprecation-contracts/function.php’ (include_path=’.;C:\php\pear’) in F:\phpstudy_pro\xyn\heyangtang-crm\thinkphp\library\think\Loader.php on line 676
解决方案：
composer dump-autoload
composer update
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