Please what did you do to resolve it. I'm having the same issue.
when you receive error " A branch named 'gh-pages' already exists.", you have to delete the .config sub-folder in gh-pages folder in node_module.
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Please what did you do to resolve it. I'm having the same issue.
when you receive error " A branch named 'gh-pages' already exists.", you have to delete the .config sub-folder in gh-pages folder in node_module.