Cannot launch site/environment that worked yesterday

[nickc]

Sorry that you ran into this, @AaronECP. Have you rebooted since the update?

We’ve seen similar issues in the past solved by restarting:

Multisite installation (Subdomain): Uh-oh! Unable to start site. TypeError: Cannot convert undefined or null to object

@nickc , I just sent you the sites.json file. I also added other info. For the casual reader of this post, the main thing to keep in mind is: it may be possible the site can start completely closing Local WP and then reopening it.