Having the same problem: Application Manager Operation Failed.

Log:
hildon-application-manager 2.2.71
E: Encountered a section with no Package: header
E: Problem with MergeList /var/lib/apt/lists/downloads.maemo.nokia.com_fremantle_ssu_apps_._Pac kages
E: The package lists or status file could not be parsed or opened.
E: Encountered a section with no Package: header
E: Problem with MergeList /var/lib/apt/lists/downloads.maemo.nokia.com_fremantle_ssu_apps_._Pac kages
E: The package lists or status file could not be parsed or opened.
E: Encountered a section with no Package: header
E: Problem with MergeList /var/lib/apt/lists/downloads.maemo.nokia.com_fremantle_ssu_apps_._Pac kages
E: The package lists or status file could not be parsed or opened.

DISCONNECTED from (null)

Could anyone help?

I know nothing of programming.