Dereference of a possibly null reference.

Dereference of a possibly null reference.

'ServicePointManager' is obsolete: 'WebRequest, HttpWebRequest, ServicePoint, and WebClient are obsolete. Use HttpClient instead. Settings on ServicePointManager no longer affect SslStream or HttpClient.' (https://aka.ms/dotnet-warnings/SYSLIB0014)

'ServicePointManager' is obsolete: 'WebRequest, HttpWebRequest, ServicePoint, and WebClient are obsolete. Use HttpClient instead. Settings on ServicePointManager no longer affect SslStream or HttpClient.' (https://aka.ms/dotnet-warnings/SYSLIB0014)

'X509Certificate2.X509Certificate2(byte[])' is obsolete: 'Loading certificate data through the constructor or Import is obsolete. Use X509CertificateLoader instead to load certificates.' (https://aka.ms/dotnet-warnings/SYSLIB0057)

'X509Certificate2.X509Certificate2(byte[])' is obsolete: 'Loading certificate data through the constructor or Import is obsolete. Use X509CertificateLoader instead to load certificates.' (https://aka.ms/dotnet-warnings/SYSLIB0057)

'NSPasteboard.NSPasteboardTypeFileUrl' is obsolete: 'Use the 'NSPasteboardType' enum instead.'

'NSPasteboard.NSPasteboardTypeFileUrl' is obsolete: 'Use the 'NSPasteboardType' enum instead.'

'NSPasteboard.NSPasteboardTypeFileUrl' is obsolete: 'Use the 'NSPasteboardType' enum instead.'