url no longer pointing to my wordpress, ERROR

i’ve had the same wordpress address for 7 years now:
noavi.com/journal
i plan to keep it for a long time.
this week i replaced my old website at noavi.com with a new website built on squarespace using the same domain.
i created a page with a slug named “noavi.com/journal” hoping to point it to my existing wordpress but i instead created an error.

can someone please help ? do i need to adjust a setting in my ftp ? have i made some kind of terrible loop ? do i need to change some DNS zone setting?
very lost, any help would be much appreciated.
thanks,
noa