Failed to add class member error solution

Failed to add class member result Failed to import into PCB file normally when converting files with AD20 today.

many solutions on the web are to delete the PCB and create a new PCB and re-import it. A little trouble. Here is another way you can not remove the PCB, useful measurement

there are most of this kind of problem before import once, and then deleted after the second when import to this mistake.

solution :

(1) switch to PCB file, menubar – design – classes (classes if not chinese-typed)

(2)

(3)