本地执行hexo s 时报错：
WARN No layout: index.html
原因：theme 没有下载下来，经查，theme文件夹下为空。
新建文章后，执行 hexo g 时报如下错误：
(node:1172) [DEP0061] DeprecationWarning: fs.SyncWriteStream is deprecated.
INFO Start processing
FATAL Something's wrong. Maybe you can find the solution here: http://hexo.io/docs/troubleshooting.html
Template render error: (unknown path) [Line 21, Column 171]
Error: Unable to call `now`, which is undefined or falsey
at Object.exports.prettifyError (E:sharpcj_web
ode_modules\_nunjucks@2.5.2@nunjuckssrclib.js:34:15)
at E:sharpcj_web
ode_modules\_nunjucks@2.5.2@nunjuckssrcenvironment.js:486:31
at new_cls.root [as rootRenderFunc] (eval at _compile (E:sharpcj_web
ode_modules\_nunjucks@2.5.2@nunjuckssrcenvironment.js:565:24), <anonymous>:18:3)
at new_cls.render (E:sharpcj_web
ode_modules\_nunjucks@2.5.2@nunjuckssrcenvironment.js:479:15)
at new_cls.renderString (E:sharpcj_web
ode_modules\_nunjucks@2.5.2@nunjuckssrcenvironment.js:327:21)
at E:sharpcj_web
ode_modules\_hexo@3.3.7@hexolibextend ag.js:66:9
at Promise._execute (E:sharpcj_web
ode_modules\_bluebird@3.5.0@bluebirdjs
eleasedebuggability.js:300:9)
at Promise._resolveFromExecutor (E:sharpcj_web
ode_modules\_bluebird@3.5.0@bluebirdjs
eleasepromise.js:483:18)
at new Promise (E:sharpcj_web
ode_modules\_bluebird@3.5.0@bluebirdjs
eleasepromise.js:79:10)
at Tag.render (E:sharpcj_web
ode_modules\_hexo@3.3.7@hexolibextend ag.js:64:10)
at Object.tagFilter [as onRenderEnd] (E:sharpcj_web
ode_modules\_hexo@3.3.7@hexolibhexopost.js:253:16)
at E:sharpcj_web
ode_modules\_hexo@3.3.7@hexolibhexo
ender.js:65:19
at tryCatcher (E:sharpcj_web
ode_modules\_bluebird@3.5.0@bluebirdjs
eleaseutil.js:16:23)
at Promise._settlePromiseFromHandler (E:sharpcj_web
ode_modules\_bluebird@3.5.0@bluebirdjs
eleasepromise.js:512:31)
at Promise._settlePromise (E:sharpcj_web
ode_modules\_bluebird@3.5.0@bluebirdjs
eleasepromise.js:569:18)
at Promise._settlePromise0 (E:sharpcj_web
ode_modules\_bluebird@3.5.0@bluebirdjs
eleasepromise.js:614:10)
at Promise._settlePromises (E:sharpcj_web
ode_modules\_bluebird@3.5.0@bluebirdjs
eleasepromise.js:693:18)
at Async._drainQueue (E:sharpcj_web
ode_modules\_bluebird@3.5.0@bluebirdjs
eleaseasync.js:133:16)
at Async._drainQueues (E:sharpcj_web
ode_modules\_bluebird@3.5.0@bluebirdjs
eleaseasync.js:143:10)
at Immediate.Async.drainQueues [as _onImmediate] (E:sharpcj_web
ode_modules\_bluebird@3.5.0@bluebirdjs
eleaseasync.js:17:14)
at runCallback (timers.js:800:20)
at tryOnImmediate (timers.js:762:5)
原因： 文章中有不识别的字符：
原文内容中
