Problem packing "Online Subsystem Steam"

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I made all the steps on this page:

Hi, your post is you very vague, you need to give us more details. Does your build only fail when you try to implement “Online Subsystem Steam”? maybe I’ve just missed it but I don’t see anything in your log that’s pointing out online subsystem steam as the cause of the problem.

Everything works but when I turn on the “online subsystem steam” I can not pack the project