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The issue is that the package you deleted was already made public. We keep traces of these around, to make sure the URL can't be taken over. I can either completely delete it, or I can undelete it so you can just upgrade it with a new version.
Thanks, please undelete it.
I have upload an extension before. But now I delete by mistake. When I upload it again, the system said "A package with this name already exists. Please change the name or upgrade the existing package.", actually I'm the owner of this add-on, and I can't find any entry to get the deleted on back.