Issues with 2008R2 to 2012 upgrade

Hi All,

I try to upgrade MSSQL 2008R2 SP2 to MSSQL 2012 SP1, but receive the error:

(10) 2013-10-30 02:23:49 Slp: Initializing rule      : Incomplete upgrade
(10) 2013-10-30 02:23:49 Slp: Rule is will be executed  : True
(10) 2013-10-30 02:23:49 Slp: Init rule target object: Microsoft.SqlServer.Configuration.SetupExtension.FailedUpgradeCheckFacet
(10) 2013-10-30 02:23:49 Slp: Rule 'IncompleteUpgradeCheck' detection result: HasFailedUpgrade = True, : UpgradeFailedAfterPONR = False
(10) 2013-10-30 02:23:49 Slp: Evaluating rule        : IncompleteUpgradeCheck
(10) 2013-10-30 02:23:49 Slp: Rule running on machine: SRV1
(10) 2013-10-30 02:23:49 Slp: Rule evaluation done   : Succeeded
(10) 2013-10-30 02:23:49 Slp: Rule evaluation message: SQL Server upgrade completed successfully.
(10) 2013-10-30 02:23:49 Slp: Send result to channel : RulesEngineNotificationChannel
(10) 2013-10-30 02:23:49 Slp: Initializing rule      : Previous upgrade
(10) 2013-10-30 02:23:49 Slp: Rule is will be executed  : True
(10) 2013-10-30 02:23:49 Slp: Init rule target object: Microsoft.SqlServer.Configuration.SetupExtension.FailedUpgradeCheckFacet
(10) 2013-10-30 02:23:49 Slp: Rule 'FailedUpgradeCheck' detection result: HasFailedUpgrade = True, : UpgradeFailedAfterPONR = False
(10) 2013-10-30 02:23:49 Slp: Evaluating rule        : FailedUpgradeCheck
(10) 2013-10-30 02:23:49 Slp: Rule running on machine: SRV1
(10) 2013-10-30 02:23:49 Slp: Rule evaluation done   : Failed
(10) 2013-10-30 02:23:49 Slp: Rule evaluation message: A previous upgrade that failed was detected. To retry the upgrade, remove the upgraded feature that failed, and then run the upgrade again.
(10) 2013-10-30 02:23:49 Slp: Send result to channel : RulesEngineNotificationChannel

Can you tell me what the "feature that failed" I must to remove for upgrade? How can I determine this feature?

Best regards,

Maxim