TypeError:Cannot call method ‘slice’ of null at convert_tree_to_html (d:\blog\node_modules\markdown\lib\markdown.js:1556:

1. at Object.toHTMLTree (d:\blog\node_modules\markdown\lib\markdown.js:112:14) at Object.toHTML (d:\blog\node_modules\markdown\lib\markdown.js:82:22) at d:\blog\models\post.js:91:33 at Array.forEach (native) at d:\blog\models\post.js:90:16 at d:\blog\node_modules\mongodb\lib\mongodb\cursor.js:162:16 at commandHandler (d:\blog\node_modules\mongodb\lib\mongodb\cursor.js:706:16 ) at d:\blog\node_modules\mongodb\lib\mongodb\db.js:1806:9 at Server.Base._callHandler (d:\blog\node_modules\mongodb\lib\mongodb\connec tion\base.js:442:41)

[[[[[[[[[[@nswbmw](/user/nswbmw)](/user/nswbmw)](/user/nswbmw)](/user/nswbmw)](/user/nswbmw)](/user/nswbmw)](/user/nswbmw)](/user/nswbmw)](/user/nswbmw)](/user/nswbmw) 在跟做你教程到添加标签的时候出错，现在blog都运行不起来，一在网页中访问就报这个错，求助！！！！