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Fatal error: Uncaught RuntimeException: Unable to emit response; headers already sent in /var/www/html/vendor/zendframework/zend-diactoros/src/Response/SapiEmitterTrait.php:37 Stack trace: #0 /var/www/html/vendor/zendframework/zend-diactoros/src/Response/SapiEmitter.php(30): Zend\Diactoros\Response\SapiEmitter->assertNoPreviousOutput() #1 /var/www/html/library/BaseAction.php(321): Zend\Diactoros\Response\SapiEmitter->emit(Object(Zend\Diactoros\Response)) #2 /var/www/html/public/index.php(21): require('/var/www/html/l...') #3 {main} thrown in /var/www/html/vendor/zendframework/zend-diactoros/src/Response/SapiEmitterTrait.php on line 37