Couldn't install Ubuntu through Wubi 11.10

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http://askubuntu.com – i am not being able to install ubuntu using wubi. after running wubi and selecting the drive and passwords etc. , the download starts but an error occurs which says Unsubscriptable object for more information, please see the log file: appdata\local\temp\wubi-11.10-rev245.log my operating system is windows 7 64 bit. tried for all type of drives like primary and logical also. Please help. Thanks! (HowTos)