no update of facebook and messenger after Nougat update

[AC Question]

Hi. After updating my Sony Z5 to Nougat, I found out that my facebook and messenger are not updating from the playstore. all other apps update just fine. I tried clearing cache and data of playstore. I also cleared cache and data of both facebook apps. I still get 'error code 505'. I also tried to uninstall facebook and reinstall but still i get same error. any help please.
keith