I uploaded new add-on, but failed counting. So I've tried to upload again after delete it, but error message keeps coming up.
The error message is "A package with this name already exists. Please change the name or upgrade the existing package." Can you give me some advice please?
In that case you need to somehow contact the moderators in order to restore your previous upload.
The extension name is already reserved.
We do so in order to prevent newly uploaded extension to fake some older and deleted one.