Unhandled Error handling can be done using a Subprocess. This means that instead of a single Error handler that catches errors from a specific Task or Element, the Unhandled Error Handler Subprocess handles errors from every part of the Process. Unhandled Error Handler can be set from the Process' main settings:

To enable this feature, click on the 'Select subprocess to call on an Unhandled Error' option. This will open settings for the Subprocess call:

Here you can select which Subprocess is responsible for the Unhandled Error handling. As with regular a Subprocess call, an Unhandled Error Handler can also be set as a remote call by enabling it from the Advanced settings.

The next article is Introduction to Call Subprocess