Latest update error

Our site is currently on J3.10.6. We just installed your latest update for Mobile Menu CK. It disabled user login and generated a stream of error messages as below. Switching off plugin System - Mobile Menu CK restores user login and stops the error message. Please advise a fix.
Thanks

A PHP Exception occurred on your site. Here you can find the stack trace:
Exception Type: Error
File: .../plugins/system/mobilemenuck/mobilemenuck.php
Line: 383
Message: Class 'Joomla\Module\Menu\Site\Helper\MenuHelper' not found

Hi
I'm sorry for this problem that occurs on joomla 3
please install the 1.5.3 version, I have reverted the changes until I deliver a working version

CEd

Problem fixed. Thank you for such a quick response.