[Plugin: WPBook lite] – access token error

Hi there,
I’m getting this error when I try to generate an access token in the grant permissions part of the setup:

WP Error occured in trying to get token: Token url was https://graph.facebook.com/oauth/access_token?client_id=396317600408268&redirect_uri=https://hamptonhowe.ruminoid.co.uk/blog/%3Fwpbook=oauth&client_secret=66ab2567028ba70fec40bf137142eaeb&code=AQB_2ym8ofaTgzD7aGniSITCdLnnLYv3uLp_a6mgV3eLPVZruVreydYui200A3yEmnCVdAqAH8UDm3EIJaNc2ijSoOmCOsgpBd-ynGuT7nTR_75fqfGeJBC-kriYMT2jBV7tTX-JUB7TCn-FaidM-mD45CJHxpgsJAOYkUVfnA066829F90u6bDDTHY6htxKg1Q WP Error is name lookup timed out

Any thoughts would be gratefully received ??

https://www.ads-software.com/extend/plugins/wpbook/