Fatal Error - Blank Frontage after Joomla upgrade to 3.8.5

-- url of the page with the problem -- : lightningridgeinfo.com.au/
-- HikaShop version -- : 3.3
-- HikaSerial version -- : 2.1
-- Joomla version -- : 3.8.5
-- PHP version -- : 7.0.27
-- Browser(s) name and version -- : Chrome and Firefox
-- Error-message(debug-mod must be tuned on) -- : Fatal error: Cannot redeclare hikaserialBuildRoute() (previously declared in /home/viewebne/public_html/lightningridgeinfo.com.au/components/com___compo_name__/router.php:12) in /home/viewebne/public_html/lightningridgeinfo.com.au/components/com_hikaserial/router.php on line 41

All was working fine until I updated to latest Joomla 3.8.5... now site is blank on the frontend. (500 Error)

Help ASAP greatly appreciated!

Ok... I have managed to fix/track down.... still confused though..

Through the upgrade process, there seems to have been an erroneous component created and tracking that down in cpanel (file manager) there it was, with Hikaserial files in it) - attached is the now deleted folder for info.

As you can see, it had the directory name of com___compo_name__, which also corresponds to the erroneous menu item in the components.

It must have been a gremlin through the update process of either joomla, hikashop, or serial.

So that is solved....

BUT, how do I get rid of the erroneous menu item in the backed? (see image)