wpgeodirectory Multilocation Add-on cause site to crash

I just purchased the full version of wpgeodirectory yesterday.

One of my developers have tried to install the Multilocation Add-on, and the whole site went totally down (basically i cant access and he told me its error 500). I am very upset after purchasing it, luckily he manage to remove the plugin to recover back the website.

I have asked him to explain in detail, roughly this is what he has given me (please check the attachments):

– if you check the image error 1, he says he has activated the location plugin
– image error 2 is how he followed the youtube with the option for multilocation
– image error 3 on our website still dont have option eventhough its activated

I am using WordPress 4.9.7 running Twenty Fourteen Child theme.

Incase you need to check my website, its harta.net. I am trying to have the wpgeodirectory as one of the listings page of the current wordpress website.

Do let me know if you need more details, will try my best to get it, the above is the best I could get to from my developer.

Do let me know how to solve this, otherwise, I want a refund. Its totally not workable with my current setup.