Visual Studio Xamarin iOS Storyboard - An Error Occured on the Designer Agent

When opening the Main.storyboard file on the Visual Studio, I got an error:

Something went wrong. An error occured on the Designer Agent. Object reference not set to an instance of an object. Contents of C:\Users\Username\AppData\Local\Xamarin\Logs\14.0\iOSDesigner-9236.2017-01-15__09-14-29.log: MDAddinsHash: c92d0626d347XXXXXXXXX

I have all the requirements:

  • Both Xamarin for Visual Studio (on Windows) and Xamarin Studio Community (on the Mac) are the latest version (updated at the same time recently). Both use Stable channel.
  • The Visual Studio is connected to the Mac using Xamarin Mac Agent.
  • iOS Developer and Provisioning Profiles are set correctly on the Mac. On the Keychain Access, I see that the iPhone Developer certificate is valid.

Here is the Xamarin full log file from the Visual Studio:

http://pastebin.com/11GURqGd

What should I do to fix this issue?

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