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Why is this an issue?
When a class has only a private constructor, it can’t be instantiated except within the class itself. Such classes can be considered
dead code and should be fixed
Exceptions

  
 Classes that access their private constructors (singletons or smart
  enums) are ignored. 
  
 Classes with only static members are also ignored because they are covered by Rule {rule:vbnet:S1118}. 
  
 Classes that derive from SafeHandle since
  they can be instantiate through P/Invoke. 

How to fix it
Code examples
Noncompliant code example
Public Class [MyClass] ' Noncompliant: the class contains only private constructors
    Private Sub New()
        ' ...
    End Sub
End Class

Compliant solution
Public Class [MyClass] ' Compliant: the class contains at least one non-private constructor
    Public Sub New()
        ' ...
    End Sub
End Class

Resources
Documentation

  
 {rule:vbnet:S1118} - Utility classes should not have public constructors 
  
 Microsoft Learn - SafeHandle Class 
  
 Microsoft Learn - Platform Invoke (P/Invoke) 
  
 Microsoft Learn - Use
  enumeration classes instead of enum types 
  
 Wikipedia - Dead code 
  
 Wikipedia - Singleton pattern