I am developing a Unity extension editor.
When I try to build an avatar with the project containing the editor I created, I get an All pipe instances are busy error and cannot upload it. There is nothing wrong with the avatar and this problem occurs on any PC.

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I spent a month trying to resolve this. But I could not solve it.
Can someone please help me?
The following is an installer that will be automatically added to the project.

It is also available on Github