PHP fatal error sendRequest

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Summary

When i run the following function:

function mailerliteAddEmail($email, $username) {
	$mailerliteClient = new \MailerLite\MailerLite(['api_key' => "xxx"]);
	$subscriberData = [
		'email' => $email,
		'fields' => [
			'name' => $username
		],
		'groups' => [
			113072541
		]
	];
	try {
		$apiResponse = $mailerliteClient->subscribers->create($subscriberData);
	} catch (\Exception $exception) {
		error_log("Errore Mailerlite: " . $exception->getMessage());
	}

	mailerliteAddEmailOld($email, $username);
}

I get the following error:
PHP Fatal error: Declaration of Http\\Client\\Curl\\Client::sendRequest(Psr\\Http\\Message\\RequestInterface $request) must be compatible with Psr\\Http\\Client\\ClientInterface::sendRequest(Psr\\Http\\Message\\RequestInterface $request): Psr\\Http\\Message\\ResponseInterface in /var/www/html/hydestore/mailerlite/php-http/curl-client/src/Client.php on line 111

Expected Results

The expected result is that the function works without errors.

Actual Results

Error printed.

Steps to Reproduce

1. Install the latest version from composer
2. Execute the example provided