These Plugins were missing widgets JSON files and they were using default format for the fields.
The UI needs to show better error message in this scenario, currently it just shows "Syntax error in config file". Ideally it should say something like "Using Default format for the fields, the widget file is either missing or invalid for this plugin"
Please update the error message
Reopened since we need to add a FAQ section in docs to have error messages and how to fix things if the user sees the error in the UI.