XMPPHP Error: Array to string conversion

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My Sample code:

$conn = new XMPP($XMPP_HOST, $XMPP_PORT, $XMPP_USER, $XMPP_PASSWORD, $XMPP_RESOURCE , $XMPP_HOST,$printlog = true, $loglevel=XMPPLOG::LEVEL_ERROR);

$conn->useEncryption(false);

$conn->connect();

$conn->processUntil(‘session_start’);

$conn->presence();

$conn->message(‘ob_test’.’@’.$XMPP_DOMAIN, “test”, ‘chat’);

//$payloads = $conn->processUntil(‘message’);

$conn->disconnect();

When i run this code then i get the below error.

#0 C:\wamp64\www\woc\api\app\Libraries\XMPPHP\XMLStream.php(655): Illuminate\Foundation\Bootstrap\HandleExceptions->handleError(8, ‘Array to string…’, ‘C:\wamp64\www\w…’, 655, Array)

#1 [internal function]: App\Libraries\XMPPHP\XMLStream->endXML(Resource id #245, ‘STREAM:FEATURES’)

#2 C:\wamp64\www\woc\api\app\Libraries\XMPPHP\XMLStream.php(477): xml_parse(Resource id #245, ‘<stream:feature…’, false)

#3 C:\wamp64\www\woc\api\app\Libraries\XMPPHP\XMLStream.php(553): App\Libraries\XMPPHP\XMLStream->_’…

If i comment the red color line of “session_start” then it is working but not receiving the message.

Please help me if anyone has idea.

Using : Laravel 5.3,

XMPPHP: GitHub - BirknerAlex/XMPPHP: Original fork from svn://netflint.net/xmpphp

Openfire: 4.0.4