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Updating the modifiers of a [type | member | parameter modifier] will prevent the debug session from continuing while Edit and Continue is enabled
This error indicates that you tried to edit the modifiers of a type, member, or parameter modifier, which cannot be changed while debugging. This may include:
- Changes to accessibility. 
- Addition or removal of abstract, virtual, sealed, unsafe, partial, override, new, static for types and members. 
- Changes to ref, out, and params for parameters. 
For example, consider the following code:
internal class Program
{
static void Main(string[] args) {}
}
If you step into Main, then change internal to public, this error occurs.
To correct this error
- Choose Undo from the Debug menu to undo the change. - –or– - On the Debug menu, click Stop Debugging, make your changes, then start a new debugging session.