Fatal error: Uncaught Error: Class 'think\App' not found in D:\phpStudy\WWW\thinkphp\library\think\exception\Handle.php:44 Stack trace: #0 D:\phpStudy\WWW\thinkphp\library\think\Error.php(48): think\exception\Handle->report(Object(think\exception\ThrowableError)) #1 [internal function]: think\Error::appException(Object(think\exception\ThrowableError)) #2 {main} thrown in D:\phpStudy\WWW\thinkphp\library\think\exception\Handle.php on line 44

Fatal error: Uncaught Error: Class 'think\App' not found in D:\phpStudy\WWW\thinkphp\library\think\exception\Handle.php:44 Stack trace: #0 D:\phpStudy\WWW\thinkphp\library\think\Error.php(48): think\exception\Handle->report(Object(think\exception\ErrorException)) #1 D:\phpStudy\WWW\thinkphp\library\think\Error.php(89): think\Error::appException(Object(think\exception\ErrorException)) #2 [internal function]: think\Error::appShutdown() #3 {main} thrown in D:\phpStudy\WWW\thinkphp\library\think\exception\Handle.php on line 44