weblogic.management.provider.EditFailedException: Can not undo unactivated changes while an activate changes operation is still in progress

I was desperately trying to activate some changes, and it keeps failing. Then I undo the changes, and I get this:

"weblogic.management.provider.EditFailedException: Can not undo unactivated changes while an activate changes operation is still in progress"

Workaround:

cd /opt/oracle/domains/osbpl1do/pending
rm -rf *

and restart all. That should clean up the mess.