Today when I tried to start the Main.storyboard file of my project, I got this error:
Previously I started this file many times without any problem.
After getting this error, I also tried to start the storyboard file of the sample project Hello iOS, and it also failed with the same error.
I have updated both Xamarin Visual Studio and Xamarin on Mac to their latest versions.
Another detail: There was a warning in Xamarin log file: "There is a mismatch between the installed Xamarin.iOS (version 10.8) on and the local Xamarin.iOS (version 10.8.0.174). While this may not be an issue, it might cause unexpected behaviors. When applying updates, make sure to keep both the Mac and Windows in sync." This is strange because both of them are up-to-date and still mismatch?
Please help me to solve this problem. Thank you.
FYI. Here is my system's configuration: