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I just came across the same problem.
In my case, I hit this issue while trying to reinstall Oracle EMCC 12g.
Since previous installation failed, I decided to start from the beginning again but I am now hitting this.
Before trying to reinstal, I dropped SYSMAN and a few other users created on the provided DB.
Did you solve this issue?
I believe I may have not "clean up" the database properly. Which would be the right way of wiping out the DB without actually rebuild it again?