Project errors (.Net Core) on 16.0.655

[Dasha]

Hello! Need help.
The project was rewritten to .Net Core from .Net.Framework. And it's come:

Unhandled Exception: System.NullReferenceException: Object reference not set to an instance of an object.
at System.SpanHelpers.IndexOf(Byte& searchSpace, Byte value, Int32 length)
at System.String.Ctor(SByte* value)
at System.StubHelpers.CSTRMarshaler.ConvertToManaged(IntPtr cstr)
Aborted

Has anyone encountered something similar on version 16.0.655?

 

[VoIPTools]

We have not experienced this problem.