How to use xpath to store response data


I’m having trouble to implement xpath to store the response data.

Response Body:

some value
BDD Tester



When trying this I'm getting type mismatch error. Is this the right way to implement xpath? I'm new to gatling and couldn't find much info on xpath online.
Thanks in advance 

Well, there are tons of XPath tutorials out there, not specific to Gatling.
Just make sure to declare any extra namespace?