sublime插件OmniMarkupPreviewer出现buffer_id(28) is not valid错误解决办法

sublime的插件OmniMarkupPreviewer提供markdown编辑时实时预览功能，但是今天在打开预览时出现如下错误：'buffer_id(28) is not valid (closed or unsupported file format)'

查询得知解决办法如下：

Quick Fix 1: Remove Strikethrough Extension

Sublime Text > Preferences > Package Settings > OmniMarkupPreviewer > Settings - User粘贴如下代码

{
    "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.