Errors don't occur in a vacuum. Often one error will be connected to others that are occurring in your code. Within an error analysis, you can view these related errors.
If an error has caused rethrows or has other errors related to it, a Related errors dropdown menu will be shown in the analysis for that error. Clicking it will list all the related errors and rethrows for that error, as well as their types (caught or uncaught exception, HTTP error, or log error). The bold entry indicates the error you are currently viewing.
Viewing related errors and rethrows in an error analysis