Fatal error: Namespace declaration statement has to be the very first statement or after any declare call in the script in /www/wwwroot/admin.702035.com/thinkphp/library/think/App.php on line 13

Fatal error: Uncaught Error: Class "think\App" not found in /www/wwwroot/admin.702035.com/thinkphp/library/think/exception/Handle.php:44 Stack trace: #0 /www/wwwroot/admin.702035.com/thinkphp/library/think/Error.php(47): think\exception\Handle->report() #1 /www/wwwroot/admin.702035.com/thinkphp/library/think/Error.php(87): think\Error::appException() #2 [internal function]: think\Error::appShutdown() #3 {main} thrown in /www/wwwroot/admin.702035.com/thinkphp/library/think/exception/Handle.php on line 44