iOS xamarin application upgrade version

Job ID: 33438649

Budget: €30 – €250 EUR

Hello,
I'm getting error compiling the app while updtating for iOS 15
Error Could not load file or assembly 'System.Buffers, Version=4.0.2.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51' or one of its dependencies. Impossibile trovare il file specificato. Prometeo.Application

Need help thaks

Related categories: Mobile App Development C# Programming Objective C Xamarin Visual Studio