Ubuntu One file sync does not work on 12.04

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http://askubuntu.com – I am experiencing file sync failure in Ubuntu One at 12.04 for about one month It happened without any notice and still continues. <> When I launch Ubuntu One, File Sync does not start. When I click "Sync File" button in top right, it says "auth failed (AUTH_FAILED)" and gives dialog "I am sorry but we need to close Ubuntu One due to erros" (message in Japanese, so this is my translation), with the following output: UnauthorizedError u'\u30db\u30b9\u30c8\u306e\u8a8d\u8a3c\u304c\u5fc5\u8981\u3067\u3059' u'OAuth required (mandatory).' (It seems that these strings are Unicode character, p (HowTos)