I searched alot about this case and I found some relative posts about this issue, But I think mine is a little bit diff,
however I Can’t really find out what I’ve to do.
1-When adding a childClass from editor it send me this message
2-then it say it’s already in used by another class, However, When I closed the editor and open VS I notice it’s already added the New Child Class, But if I tried to compile the project this happened exactly
any suggestion?!