I can't create a package for the Assets Store

I’m using MacosX (10.6.8) I have the last Unity version and Assets store tools.

When trying to make a package in the assets store I get this message:

Could not create package: Error receiving response from server (403): The remote server returned an error: (403) Forbidden.

In console:
Could not create package: Error receiving response from server (403): The remote server returned an error: (403) Forbidden.
UnityEngine.Debug:Log(Object)
c__AnonStorey19:<>m__1F(String)
c__AnonStorey6:<>m__6(AssetStoreResponse)
AssetStoreClient:m__18(Pending)
System.Collections.Generic.List1:RemoveAll(Predicate1)
AssetStoreClient:Update()
UnityEditor.EditorApplication:Internal_CallUpdateFunctions()

I get the exact same thing. I’m also on 10.6.8