thank you guys. I think you fixed it.
Havent been able to see the submitted form sent by you, as i dont get them,
but i think all is good, and the error has not shown again on the dashboard.
Thank you @a2hostingrj & @dominicbowkett for your answers.
Cleared caches, logged out, tryed different users, etc. no change.
I believe this error has appeared since last wordpress updated to 4.7.2 but i am not sure.