404 issue with WP Job Manager plugin

Hello and thank you for this great plugin.

I have same issue as amery here :
http://wordpress.org/support/topic/i-get-404-for-single-job-post-pages?replies=10

but I reading the post I think I have identified that inFocus theme as responsible for the conflict.

How could I make Job Manager working on inFocus ?

Thank you.

https://wordpress.org/plugins/wp-job-manager/