The "Browser is Unavailable" message is encountered when the Browser is being terminated unexpectedly, during the Process execution.


Solution

In order to handle the exception, one of the two (2) methods shown in the attached screenshots can be followed.


Notes

The Browser Instance can be monitored directly, via its ".Handle" property, or indirectly, via the "If Window" Action.


Always make sure that the %Browser% variable has not been terminated by the "Close Web Browser" Action.