preview issue (HTTP 500)

[sasdj2418]

Steps required to reproduce the problem

1. Link all tags
2. Can't see any error message explaining the reason.
3. developer tools can see network http 500 error

Expected Result

• Preview

Actual Result

• No preview

Environment Info

Version: 0.2.3
URL: https://www.edh.tw/article/21534 (Every article)
Rules:

{
    "generator_name": "facebook-instant-articles-builder",
    "generator_version": "0.2.3",
    "rules": [
        {
            "class": "TextNodeRule"
        },
        {
            "class": "GlobalRule",
            "selector": "html",
            "properties": {
                "article.title": {
                    "attribute": "content",
                    "selector": ".article-detail .article .title",
                    "type": "element"
                },
                "author.name": {
                    "attribute": "itemprop",
                    "selector": ".article-detail .article .date-author .autor",
                    "type": "string"
                },
                "image.url": {
                    "attribute": "src",
                    "selector": ".article-detail .article_img img",
                    "type": "string"
                },
                "article.body": {
                    "attribute": "itemprop",
                    "selector": "#article_page",
                    "type": "element"
                },
                "article.canonical": {
                    "attribute": "href",
                    "selector": "link[rel=canonical]",
                    "type": "string"
                }
            }
        },
        {
            "class": "BlockquoteRule",
            "selector": "blockquote"
        },
        {
            "class": "ParagraphRule",
            "selector": "p"
        },
        {
            "class": "H2Rule",
            "selector": "h2"
        },
        {
            "class": "H1Rule",
            "selector": "h1"
        },
        {
            "class": "ListElementRule",
            "selector": "ol, ul"
        },
        {
            "class": "ListItemRule",
            "selector": "li"
        },
        {
            "class": "AnchorRule",
            "selector": "a",
            "properties": {
                "anchor.href": {
                    "attribute": "href",
                    "selector": "a",
                    "type": "string"
                }
            }
        },
        {
            "class": "ItalicRule",
            "selector": "i"
        },
        {
            "class": "EmphasizedRule",
            "selector": "em"
        },
        {
            "class": "BoldRule",
            "selector": "b, strong"
        },
        {
            "class": "ImageRule",
            "selector": "img",
            "properties": {
                "image.url": {
                    "attribute": "src",
                    "selector": "img",
                    "type": "string"
                },
                "image.caption": {
                    "attribute": "src",
                    "selector": "img",
                    "type": "element"
                }
            }
        }
    ]
}