404 error on preview ... "buffer_id(29) is not valid (closed or unsupported file format)"

利用sublime text2的插件OmniMarkupPreview进行md文件预览时，出现如下错误

"Error: 404 Not Found
Sorry, the requested URL 'http://127.0.0.1:51004/view/29' caused an error:

'buffer_id(29) is not valid (closed or unsupported file format)'

快速修复方法

Quick Fix 1: Remove Strikethrough Extension

Sublime Text > Preferences > Package Settings > OmniMarkupPreviewer > Settings - User
paste the following to remove the strikeout package.

{
    "renderer_options-MarkdownRenderer": {
        "extensions": ["tables", "fenced_code", "codehilite"]
    }
}
Quick Fix 2: Fix the Strikethrough Extension (if you need it)

Find the python-markdown sublime package.

On the Mac: subl "/Users/<username>/Library/Application Support/Sublime Text 3/Packages/OmniMarkupPreviewer/OmniMarkupLib/Renderers/libs/mdx_strikeout.py"

Replace the makeExtension() method with the following:

def makeExtension(*args, **kwargs):
    return StrikeoutExtension(*args, **kwargs)
Save, quit and reload Sublime Text.

原问题链接