Cause
You have chosen to perform a Desktop class install on a cluster. This option will not install Oracle RAC.
You have chosen to perform a Desktop class install on a cluster. This option will not install Oracle RAC.
If you want to install Oracle RAC, then choose to perform a Server class install.
Try the following links for this error:
http://docs.oracle.com/cd/E16655_01/server.121/e26079/dbinstaller_errormessages.htm
https://community.oracle.com/message/4193245
https://community.oracle.com/message/4356199
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