Error 504 - Facebook app has this Error when i tried updating.

[AC Question]

I have a Samsung S6 and I have tried disabling the FB app, Uninstalling all updates, cleared the cache and cleared the data.
I have even disabled Messenger and did all the same again. Rebooted and tried again. Nothing seems to work.
Can someone please help me?
This all happened when the wifi cut off while doing an FB update.

Thank you in advance

Jörn