C# Edit and Continue: error 4007
Error Message
An active statement marker has been deleted and cannot be remapped in the current source file. You must revert your changes to continue or restart the debugging session
This message is usually the result of a rare internal error.
To undo code changes
On the Edit menu, click Undo.
This will end the debug session and start a new session.
To apply the code changes
On the Debug menu, click Restart.
This will end the debug session and start a new session.
See Also
Reference
Supported Code Changes (C#)
Edit and Continue (Visual C#)