404 error on preview ... "buffer_id(29) is not valid (closed or unsupported file format)" · Issue #85 · timonwong/OmniMarkupPreviewer

When I attempt to preview a MD file, I get the following error in the browser: "Error: 404 Not Found Sorry, the requested URL 'http://127.0.0.1:51004/view/29' caused an error: 'buffer_id(29) is no...