解决 Hexo 的 FATAL Something is wrong

使用的 hexo 搭建博客，主题是 icarus

更新时出现以下错误：

$ hexo g
INFO  =======================================
 ██╗ ██████╗ █████╗ ██████╗ ██╗   ██╗███████╗
 ██║██╔════╝██╔══██╗██╔══██╗██║   ██║██╔════╝
 ██║██║     ███████║██████╔╝██║   ██║███████╗
 ██║██║     ██╔══██║██╔══██╗██║   ██║╚════██║
 ██║╚██████╗██║  ██║██║  ██║╚██████╔╝███████║
 ╚═╝ ╚═════╝╚═╝  ╚═╝╚═╝  ╚═╝ ╚═════╝ ╚══════╝
=============================================
INFO  Checking dependencies
INFO  Validating the configuration file
INFO  Start processing
FATAL Something's wrong. Maybe you can find the solution here: https://hexo.io/docs/troubleshooting.html
Template render error: (unknown path)
  Error: filter not found: filter
    at Object._prettifyError (F:\blog\node_modules\nunjucks\src\lib.js:36:11)
    at F:\blog\node_modules\nunjucks\src\environment.js:567:19
    at Template.root [as rootRenderFunc] (eval at _compile (F:\blog\node_modules\nunjucks\src\environment.js:637:18), <anonymous>:21:3)
    at Template.render (F:\blog\node_modules\nunjucks\src\environment.js:556:10)
    at Environment.renderString (F:\blog\node_modules\nunjucks\src\environment.js:380:17)
    at Promise.fromCallback.cb (F:\blog\node_modules\hexo\lib\extend\tag.js:123:48)
    at tryCatcher (F:\blog\node_modules\bluebird\js\release\util.js:16:23)
    at Function.Promise.fromNode.Promise.fromCallback (F:\blog\node_modules\bluebird\js\release\promise.js:185:30)
    at Tag.render (F:\blog\node_modules\hexo\lib\extend\tag.js:123:18)
    at Object.onRenderEnd (F:\blog\node_modules\hexo\lib\hexo\post.js:280:20)
    at Promise.then.then.result (F:\blog\node_modules\hexo\lib\hexo\render.js:64:19)
    at tryCatcher (F:\blog\node_modules\bluebird\js\release\util.js:16:23)
    at Promise._settlePromiseFromHandler (F:\blog\node_modules\bluebird\js\release\promise.js:517:31)
    at Promise._settlePromise (F:\blog\node_modules\bluebird\js\release\promise.js:574:18)
    at Promise._settlePromise0 (F:\blog\node_modules\bluebird\js\release\promise.js:619:10)
    at Promise._settlePromises (F:\blog\node_modules\bluebird\js\release\promise.js:699:18)
    at _drainQueueStep (F:\blog\node_modules\bluebird\js\release\async.js:138:12)
    at _drainQueue (F:\blog\node_modules\bluebird\js\release\async.js:131:9)
    at Async._drainQueues (F:\blog\node_modules\bluebird\js\release\async.js:147:5)
    at Immediate.Async.drainQueues (F:\blog\node_modules\bluebird\js\release\async.js:17:14)
    at runCallback (timers.js:705:18)
    at tryOnImmediate (timers.js:676:5)

通过把文章移除_post文件夹，再运行hexo g的方式定位到了出问题的文章，又通过删除一段文字再hexo g的方式定位到了出问题的段落：

变量的值可以用过滤器修改，形如``{{ variable|filter }}``

多次尝试发现，除这种形式外，不用两个反引号引起的上段也会造成错误，原因不明。

解决方案：改用三个反引号