The context stopped responding, potentially due to a fatal error or calling exit

[langziyang]

my task is get file content form url,and return

public function run(Channel $channel, Cancellation $cancellation): mixed
    {
        $client = HttpClient::create();
        try {
            $response = $client->request('GET', $this->path);
            $content = $response->getContent();
            file_put_contents(dirname(__FILE__) . '/a.pdf', $content);
            return $content;
        } catch (\Throwable $e) {
            file_put_contents(dirname(__FILE__) . '/a.txt', $e->getMessage());
        }
        return false;
    }

i get error:

and i use file_put_contents(dirname(FILE) . '/a.pdf', $content); to save the file just for test, the file has 40.7M.

is the file size to big so get the error?