之前更换系统后，博客一直就没有继续更新了，今日重新clone下来，顺利地yarn install之后，执行yarn server时发生错误
pandoc exited with code null.

问题描述

详细输出如下，

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zzq@ThinkPad-zzq:~/code/repo/blog$ hexo server
INFO  Validating config
INFO  ==================================
  ███╗   ██╗███████╗██╗  ██╗████████╗
  ████╗  ██║██╔════╝╚██╗██╔╝╚══██╔══╝
  ██╔██╗ ██║█████╗   ╚███╔╝    ██║
  ██║╚██╗██║██╔══╝   ██╔██╗    ██║
  ██║ ╚████║███████╗██╔╝ ██╗   ██║
  ╚═╝  ╚═══╝╚══════╝╚═╝  ╚═╝   ╚═╝
========================================
NexT version 8.9.0
Documentation: https://theme-next.js.org
========================================
INFO  Start processing
ERROR {
  err: Error: 
  [ERROR][hexo-renderer-pandoc] On /home/zzq/code/repo/blog/node_modules/hexo-theme-next/languages/README.md
  [ERROR][hexo-renderer-pandoc] pandoc exited with code null.
      at Hexo.pandocRenderer (/home/zzq/code/repo/blog/node_modules/hexo-renderer-pandoc/index.js:114:11)
      at Hexo.tryCatcher (/home/zzq/code/repo/blog/node_modules/bluebird/js/release/util.js:16:23)
      at Hexo.<anonymous> (/home/zzq/code/repo/blog/node_modules/bluebird/js/release/method.js:15:34)
      at /home/zzq/code/repo/blog/node_modules/hexo/lib/hexo/render.js:75:22
      at tryCatcher (/home/zzq/code/repo/blog/node_modules/bluebird/js/release/util.js:16:23)
      at Promise._settlePromiseFromHandler (/home/zzq/code/repo/blog/node_modules/bluebird/js/release/promise.js:547:31)
      at Promise._settlePromise (/home/zzq/code/repo/blog/node_modules/bluebird/js/release/promise.js:604:18)
      at Promise._settlePromise0 (/home/zzq/code/repo/blog/node_modules/bluebird/js/release/promise.js:649:10)
      at Promise._settlePromises (/home/zzq/code/repo/blog/node_modules/bluebird/js/release/promise.js:729:18)
      at _drainQueueStep (/home/zzq/code/repo/blog/node_modules/bluebird/js/release/async.js:93:12)
      at _drainQueue (/home/zzq/code/repo/blog/node_modules/bluebird/js/release/async.js:86:9)
      at Async._drainQueues (/home/zzq/code/repo/blog/node_modules/bluebird/js/release/async.js:102:5)
      at Immediate.Async.drainQueues [as _onImmediate] (/home/zzq/code/repo/blog/node_modules/bluebird/js/release/async.js:15:14)
      at processImmediate (node:internal/timers:464:21)
} Process failed: %s languages/README.md
INFO  Generate link [9365] for post [source/_posts/Hexo.md][ Hexo ]
INFO  Generated: categories [undefined] for post [source/_posts/Hexo.md][ Hexo ]
FATAL {
  err: Error: 
  [ERROR][hexo-renderer-pandoc] On /home/zzq/code/repo/blog/source/_posts/First集与Follow集的求法.md
  [ERROR][hexo-renderer-pandoc] pandoc exited with code null.
      at Hexo.pandocRenderer (/home/zzq/code/repo/blog/node_modules/hexo-renderer-pandoc/index.js:114:11)
      at Hexo.tryCatcher (/home/zzq/code/repo/blog/node_modules/bluebird/js/release/util.js:16:23)
      at Hexo.<anonymous> (/home/zzq/code/repo/blog/node_modules/bluebird/js/release/method.js:15:34)
      at /home/zzq/code/repo/blog/node_modules/hexo/lib/hexo/render.js:75:22
      at tryCatcher (/home/zzq/code/repo/blog/node_modules/bluebird/js/release/util.js:16:23)
      at Promise._settlePromiseFromHandler (/home/zzq/code/repo/blog/node_modules/bluebird/js/release/promise.js:547:31)
      at Promise._settlePromise (/home/zzq/code/repo/blog/node_modules/bluebird/js/release/promise.js:604:18)
      at Promise._settlePromiseCtx (/home/zzq/code/repo/blog/node_modules/bluebird/js/release/promise.js:641:10)
      at _drainQueueStep (/home/zzq/code/repo/blog/node_modules/bluebird/js/release/async.js:97:12)
      at _drainQueue (/home/zzq/code/repo/blog/node_modules/bluebird/js/release/async.js:86:9)
      at Async._drainQueues (/home/zzq/code/repo/blog/node_modules/bluebird/js/release/async.js:102:5)
      at Immediate.Async.drainQueues [as _onImmediate] (/home/zzq/code/repo/blog/node_modules/bluebird/js/release/async.js:15:14)
      at processImmediate (node:internal/timers:464:21)
} Something's wrong. Maybe you can find the solution here: %s https://hexo.io/docs/troubleshooting.html

![image-20220109175313222](hexo server遇到问题/image-20220109175313222.png)

问题分析

原来是重装系统后pandoc未安装而导致的

解决方案

安装pandoc即可，我在ubuntu下执行如下命令，

sudo apt install pandoc

问题解决