I made sure that my forum mail service was set up correctly and when I clicked "Send Test Email" I was able to receive the test email. But the system still pops up the error message "Oops! Something went wrong. Please reload the page and try again."
The same problem occurs when registering a new user. The page displays an error, but in fact, the verification email can be received normally.
The other features of the forum work just fine, I've tried searching for a lot of solutions and can't figure this out.
Error code 200
POST https://bb.gevery.cn/api/mail/test
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<b>Deprecated</b>: Callables of the form ["Swift_SmtpTransport", "Swift_Transport_EsmtpTransport::construct"] are deprecated in <b>/www/wwwroot/bb.gevery.cn/vendor/swiftmailer/swiftmailer/lib/classes/Swift/SmtpTransport.php</b> on line <b>36</b><br />
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<b>Deprecated</b>: Callables of the form ["Swift_Message", "Swift_Mime_SimpleMessage::construct"] are deprecated in <b>/www/wwwroot/bb.gevery.cn/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Message.php</b> on line <b>46</b><br />
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<b>Fatal error</b>: Uncaught Laminas\HttpHandlerRunner\Exception\EmitterException: Output has been emitted previously; cannot emit response in /www/wwwroot/bb.gevery.cn/vendor/laminas/laminas-httphandlerrunner/src/Exception/EmitterException.php:20
Stack trace:
#0 /www/wwwroot/bb.gevery.cn/vendor/laminas/laminas-httphandlerrunner/src/Emitter/SapiEmitterTrait.php(42): Laminas\HttpHandlerRunner\Exception\EmitterException::forOutputSent()
#1 /www/wwwroot/bb.gevery.cn/vendor/laminas/laminas-httphandlerrunner/src/Emitter/SapiEmitter.php(21): Laminas\HttpHandlerRunner\Emitter\SapiEmitter->assertNoPreviousOutput()
#2 /www/wwwroot/bb.gevery.cn/vendor/laminas/laminas-httphandlerrunner/src/RequestHandlerRunner.php(75): Laminas\HttpHandlerRunner\Emitter\SapiEmitter->emit()
#3 /www/wwwroot/bb.gevery.cn/vendor/flarum/core/src/Http/Server.php(45): Laminas\HttpHandlerRunner\RequestHandlerRunner->run()
#4 /www/wwwroot/bb.gevery.cn/public/index.php(26): Flarum\Http\Server->listen()
#5 {main}
thrown in <b>/www/wwwroot/bb.gevery.cn/vendor/laminas/laminas-httphandlerrunner/src/Exception/EmitterException.php</b> on line <b>20</b><br />
