get warning must be used from main thread only Xcode 11 and app crashed : I have same code and Project
When I opened in Xcode 10.2 I **did not get any warning messages like "must be used from main thread"**

But When I opened in Xcode 11.2 I **get warning messages like "must be used from main thread" and app crashed**.

This thing (must be used from main thread) happens many place on different controller in Xcode 11.2 (not in Xcode 10.2)

    [self.viewIndicator stopAnimating]; 

I also got warning message "must be used from main thread" when I stopped UIActivityIndicatorView.

I do not understand why did this happen?.

My Project run absolutely fine in Xcode 10.2 but in Xcode 11.2 my Project get warning messages like "must be used from main thread" and app crashed**.


[![enter image description here][1]][1]


  [1]: https://i.stack.imgur.com/gjbIJ.png