/usr/bin/rhythmbox:6:g_assertion_message:g_assertion_message_expr:impl_constructor:g_object_new_with_custom_constructor:g_object_new_internal

The Ubuntu Error Tracker has been receiving reports about a problem regarding rhythmbox. This problem was most recently seen with package version 3.4.1-1ubuntu1, the problem page at https://errors.ubuntu.com/problem/ebefe20830705d2cdbf30bad60b6b931103d0aa5 contains more details, including versions of packages affected, stacktrace or traceback, and individual crash reports.
If you do not have access to the Ubuntu Error Tracker you can request it at http://forms.canonical.com/reports/.