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Error during WP Plug in install "The plugin does not have a valid header"
I installed the Vanilla on through Simple Scripts. Found the Embed Plug in on Vanillaforums. Saved the plugin zip file to my computer. Installed new plugin through WP. Installed OK. When activated Plugin a screen comes up saying "The plugin does not have a valid header." The plugin doesn't show up in active plugins even though the files are on the host server under public_html/wp-content/plugins/embedvanilla. Any thoughts. Novice here.