Xamarin
A Microsoft open-source app platform for building Android and iOS apps with .NET and C#.
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Debugging my Xamarin forms app on iOS suddenly just stopped working. App builds without issue, only when trying to debug on my iPhone does this message appear:
Error running hotrestart: 'An error occurred while signing the application 'CrystalFX.app'. Details: Could not load file or assembly 'iSign.Core, Version=1.0.0.0