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Hey @Esolano , I don't have an answer to this particular error. But I see you are looking to setup the Gallery metadata loader from with Connect. Setting up the loader this way is one of two options. Have you tried the other way, by running the loader in the Designer that is sitting on your hosted Server machine?
In general I have found loaders to work more often from there, but this option also to provide more detailed error messages if things go wrong.