XenForo Problems on sending emails after upgrade to 2.3

[Hareon]

ErrorException: [E_WARNING] Undefined property: Jack\emailLog\XF\Mail\Mail::$message in src/addons/Jack/emailLog/XF/Mail/Mail.php at line 14

1. XF::handlePhpError() in src/addons/Jack/emailLog/XF/Mail/Mail.php at line 14
2. Jack\emailLog\XF\Mail\Mail->setContent() in src/XF/Mail/Mail.php at line 427
3. XF\Mail\Mail->renderTemplate() in src/XF/Mail/Mail.php at line 492...

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