Not able to save form builder

Good day
I am unable to save new entries in the form builder. There is just an orange triangle with an exclamation mark where I would normally save. I have tried to clear cache and restart. I have a good internet connection. What could be the problem? Please help.

Its ok… I used another internet source. It is fine

I am not able to save my project. It says that there is a server error. I have tried changing my internet connection but the problem persists.