Warning: Attempt to read property "replacement" on null in /var/www/src/Product/ProductController.php on line 184

Fatal error: Uncaught Narrowspark\HttpEmitter\Contract\RuntimeException: Unable to emit response: Headers already sent in file /var/www/src/Product/ProductController.php on line 184. This happens if echo, print, printf, print_r, var_dump, var_export or similar statement that writes to the output buffer are used. in /var/www/vendor/narrowspark/http-emitter/src/AbstractSapiEmitter.php:52 Stack trace: #0 /var/www/vendor/narrowspark/http-emitter/src/SapiEmitter.php(28): Narrowspark\HttpEmitter\AbstractSapiEmitter->assertNoPreviousOutput() #1 /var/www/vendor/incubator/monorepo/packages/core/src/bootstrap.php(86): Narrowspark\HttpEmitter\SapiEmitter->emit(Object(Incubator\Http\Response\HtmlResponse)) #2 /var/www/public/index.php(11): require('/var/www/vendor...') #3 {main} thrown in /var/www/vendor/narrowspark/http-emitter/src/AbstractSapiEmitter.php on line 52