But I think the solution is not to use a backup, instead of that the solution comes from AliDropship and try to investigate what happens with this new version of this addon... sooner or later I will have to update the addon to a newer version.
You get the possible solution..alidropship is not going to help you in this issue,if they could do it they was helping you until know.
That is my last solution for you but is little more andvanse.
1) backup you site first!!!!
2)delete alishipping plugin
3)going manually in your database and delete the tables of alishipping from your database.
4)make a clean install from alishipping plugin
5) good luck