grpc descriptor not found

```php
swoole

Swoole => enabled
Author => Swoole Team
Version => 5.0.2
Built => Aug 8 2023 05:57:05
coroutine => enabled with boost asm context
epoll => enabled
eventfd => enabled
signalfd => enabled
spinlock => enabled
rwlock => enabled
openssl => OpenSSL 1.1.1v 1 Aug 2023
dtls => enabled
http2 => enabled
json => enabled
zlib => 1.2.12
brotli => E16777225/D16777225
mutex_timedlock => enabled
pthread_barrier => enabled
futex => enabled
async_redis => enabled

Directive => Local Value => Master Value
swoole.enable_coroutine => On => On
swoole.enable_library => On => On
swoole.enable_preemptive_scheduler => Off => Off
swoole.display_errors => On => On
swoole.use_shortname => Off => Off
swoole.unixsock_buffer_size => 8388608 => 8388608
```

```php

PHP 8.1.12 (cli) (built: Oct 28 2022 19:11:07) (NTS)
Copyright (c) The PHP Group
Zend Engine v4.1.12, Copyright (c) Zend Technologies
```

```
Exception: Couldn't find descriptor. Note only generated code may derive from \Google\Protobuf\Internal\Message in /www/conversation/grpc/Protobuf/C2SAudio.php:30
```

```php
getAudio());

return $content;
}
}

```

```php

protobuf.C2SAudio
*/
class C2SAudio extends \Google\Protobuf\Internal\Message
{
/**
* Generated from protobuf field bytes audio = 1;
*/
protected $audio = '';

/**
* Constructor.
*
* @param array $data {
* Optional. Data for populating the Message object.
*
* @type string $audio
* }
*/
public function __construct($data = NULL) {
\GPBMetadata\Audio::initOnce();
parent::__construct($data);
}

/**
* Generated from protobuf field bytes audio = 1;
* @return string
*/
public function getAudio()
{
return $this->audio;
}

/**
* Generated from protobuf field bytes audio = 1;
* @param string $var
* @return $this
*/
public function setAudio($var)
{
GPBUtil::checkString($var, False);
$this->audio = $var;

return $this;
}

}

```