EM 12c OMS Upgrade Fails With 'Unable to upgrade. You are trying to upgrade an additional OMS'
Last updated on OCTOBER 31, 2014
Applies to:Enterprise Manager Base Platform - Version 126.96.36.199.0 and later
Information in this document applies to any platform.
An upgrade from any Enterprise Manager grid Control or Cloud Control to 188.8.131.52 fails at the Extend WebLogic Server Domain Screen with the following message:
Unable to upgrade. You are trying to upgrade an additional OMS, and not the first OMS that is configured with the Administration Server. Upgrade the first OMS before you upgrade any additional OMS instances.
The error presented to the install session is shown below:
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