Can't click Save Build

[WeatherCats]

I got a message saying there was an issue when I first clicked it. Now when clicking it it is unresponsive. I have to cancel work without progress saved.... :(

 

[The_Supermarket]

I got a message saying there was an issue when I first clicked it. Now when clicking it it is unresponsive. I have to cancel work without progress saved.... :(

What do you mean?