Troubleshooting
Error Messages and the Reasons for Their Occurrence
Namespace elements cannot be explicitly declared as private or protected.
Namespace elements cannot be explicitly declared as private or protected. For example, a top-level class within a namespace cannot be declared as private or protected. However, nested classes and other members can be declared as private or protected.
The class <class_name> is abstract and sealed.
The same class cannot be declared as abstract and sealed. The sealed modifier prevents inheritance, whereas the abstract modifier creates a generalized class from which other classes can be inherited.
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