unable to set CONTEXTUAL FILTERS according to Raw Value from Url In my project having two type of Content Type 1) Artist and 2) Work 

I have added the content for the Artist and now also i have added  the content for the Work according to Artist Name having field name (Artist field_artist    Entity reference)

On view Page i want to show the result according to the artist 

http://localhost/drupal8/artists-works/robert


According to name robert i have set the CONTEXTUAL FILTERS and Relationship.but its not showing any result 
when removed the filter its showing all the work content type type
How can I set CONTEXTUAL FILTERS and Relationship according to this
You need to add a relationship to the content, and use the title (or whatever field contains "robert") as the contextual filter instead.

Currently the query that's getting built is trying to find content with an ID of "robert", which won't work as nid is numeric.