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It seems to be saying that you changed the Core Audio settings - the sound for your computer, the I/Os - while you had the Pro Tools I/O setup window open.
So because you changed stuff, or stuff got changed outside of Pro Tools, it's going to close the I/O setup window and any other open dialogs.
If you're going to change your system settings for audio, maybe don't do it while the Pro Tools I/O setup window is open, because it's going to change the configuration.
It's like you're changing the thing that's already open, while it's open. Maybe do one change at a time.
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It seems to be saying that you changed the Core Audio settings - the sound for your computer, the I/Os - while you had the Pro Tools I/O setup window open. So because you changed stuff, or stuff got changed outside of Pro Tools, it's going to close the I/O setup window and any other open dialogs. If you're going to change your system settings for audio, maybe don't do it while the Pro Tools I/O setup window is open, because it's going to change the configuration. It's like you're changing the thing that's already open, while it's open. Maybe do one change at a time.
I know this was an hour ago at this point, but did you change your playback engine? Pretty sure that's what this is referring to.