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Updating the kind of a [structs | interface | enum | class] will prevent the debug session from continuing while Edit and Continue is enabled.
This error indicates that you tried to edit the kind of a type that cannot be changed while debugging. You tried to change a structure, interface, enumeration, or class to another type, for example, a structure to a class.
Consider the following example:
class Example
{
static void Main(string[] args) {}
}
If you step into Main, then try to change class to struct, this error occurs.
To correct this error
- Choose Undo from the Debug menu to undo the changes. - –or– 
- On the Debug menu, click Stop Debugging, make the changes, and then start a new debugging session. 
See Also
Reference
Interfaces (C# Programming Guide)