Not Working for Specific Website

I have tried many times but this extension is not working on following website.

https://www.olx.com.pk/karachi_g4060695

{"_id":"test1","startUrl":["https://www.olx.com.pk/karachi_g4060695"],"selectors":[{"id":"Titles","type":"SelectorText","parentSelectors":["root"],"selector":".IKo3 > span:nth-of-type(1)","multiple":true,"regex":"","delay":0}]}

Any support will highly appreciated.