i noticed this pop up occasionally, so did a search which lead me to this post.
the key words here being Newtonsoft.Json.JsonReaderException
which relates to Newtonsoft.Json.dll
which you’ll find tucked into one or more fxmanifest files somewhere.
that DLL is used by Hypnonema and five-vstancer resources, and presumably others that use a config.json file.
I’d say check Hypnonema as it has configuration for running its own webhost , or connecting to the dev’s own endpoint. if you dont run that resource, search for any other resources that do.