[INS-30160] Installer has detected the nodes specified for add node operation have uncleaned Inventory 

I encountered this error while extending   2 node 12c cluster to 3 nodes.

Cause:

In /ora/oracle/app/oraInventory directory there was an oraInventory directory exists. Though the directory is emptly oui still assuming that there is some content in this directory.

Action:

Delete/Remove oraInventory directory from nodes3 on which you are facing Issues. OUI will create this directory after successful addition of nodes.