Failed to add class member altium что делать
This situation occurred when converting files with AD20 today. Failed to add class member results cannot be imported into PCB files normally. 
Many solutions on the Internet are to delete the PCB and create a new PCB and import it again. It is a bit troublesome. Let’s share another method that does not delete the PCB. The actual measurement is useful.
Most of this problem occurs when it is imported once before, and then this error occurs when it is imported for the second time after deletion.
(1) Switch to PCB file, menu bar-design-class (if not finished, it is classes)
(2) Find the subsidiary item under component classes, right click to delete all that can be deleted. 
(3) Import again, you can see that the verification has been successful;
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Решение AD проблемы Не удалось добавить член класса
Когда мы проектируем, иногда появляется сообщение об ошибке Failed to add class member при импорте платы; решение следующее:
Дизайн-классы в интерфейсе печатной платы;
Компонентные классы удаляют проблемные классы;
После повторного импорта ошибка устранена.
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Altium designer transfer to pcb issue
I designing a pcb with 14 sheets in hierarchical option. While transfering my components to the PCB doc I get an error sign in some net names without error messages! With that error I get «failed to add class member» error in all sheets and in all signal harnesses.
The second issue that I encountered is in Engineering Change Order when I import the objects and executing. After it, when trying to import the same objects again, without change anything to pcb, some of the objects appear again and still remain in Engineering Change Order, I don’t see the expected «no differences detected» message. This disturbs me and I’m afraid for PCB design.
My project, compiled successfully.
6 Answers 6
The messages should point to specific parts in your schematic. Click on the message and you’ll see more in the bottom of the pane. I think «failed to add class member» is usually about parts not having footprints assigned. Project->Component Links. is often the other place to resolve ECO issues having to do with reference designator problems.
I had the same problem where «failed to add class member» prevented the component from being placed on the PCB even though the footprint was properly defined. My work-around was to placed the component manually on the PCB (Home -> Place -> Component) and set the ref des to be the same as the schematic. I then went back to the schematic and updated (Home -> Project -> Update PCB Document) and the error was gone and the netlist updated properly.
Add the library path to the pcb file then the error goes away.
Go into your SCH Library and add a footprint to the part. Recompile the library. Go to your SchDoc and Tools>Updated From Libraries or delete and add the new component back to the schematic and annotate. Go to your PcbDoc Design>Import Changes From
I usually have this problem if I create the part schematic before the footprint and forget to go back to add the footprint before compiling.
It happened to me a few times and in Altium 18 it seemed to be able to manage itself somewhat smarter — I mean the class errors were less persistent than in Altium 19 to me. Anyways, this was my ECO: 
Initially I had 3 sets of these 3 errors in both Add Components (Failed to find footprint or so), Add Component Class Members as well as in Add pins to nets sections.
Unfortunately I could not find Project->Component Links in my version 19, but applying Tools -> Update From Libraries and manually reassigning PCB Library paths for all footprints in the Tool -> Footprint Manager only cleared the Add Components errors section.
Indeed, like Devin says, manually placing the component on the PCB and editing its Designator to match the part on Schematic seems to take care of the Add Component Class Members errors. As you can see manually placing component J3 fixed the first error on my list (J3) and 2 errors in Add Pins To Nets section relating to this part as well. This is just a workaround, so would be keen to hear a more elegant way of debugging the class members.
And here is the final run of the ECO > Validate Changes showing a happy sync: 
Altium designer failed to add class member problem
the first is to delete the PCB file and create a new one, which is the most unacceptable.
the second way is to delete the CLASS in question, please refer to this article. http://blog.sina.com.cn/s/blog_6b79ac7d0101furd.html
there is another one that I just encountered this time. The problem is that although the schematic diagram encapsulation is drawn in the schematic library, there is no encapsulation when the actual schematic diagram is opened.
the solution is as follows:
1, 