Hi,
I am getting this as well. Running latest wordpress; ACF Pro 5.0.8
I have a dev site running the old ACF (Pre ACF Pro) on latest WP and it works fine…
Does downgrading to ACF PRO 5.0.7 work then?
Edit:
Does anyone know how I can get a copy of ACF Pro 5.0.7 please? (Don’t have a local copy 🙁 )
…Found it under account settings