If you run multiple instances of Sublime Text, you may want to adjust the `server_port` option in or

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If you run multiple instances of Sublime Text, you may want to adjust the server_port option in order to get this plugin work again.

https://gitmemory.com/issue/timonwong/OmniMarkupPreviewer/138/562414026

Preferences > Package Settings > OmniMarkupPreviewer > Settings - User

{
     
    "server_host": "0.0.0.0",
    "server_port": 51004,
    "renderer_options-MarkdownRenderer":
    {
     
        "extensions": ["markdown.extensions.tables", "markdown.extensions.fenced_code", "markdown.extensions.codehilite"]
    }
}
it works on my sublime version 3.2.2-3211