uiflowsコードフェンスを使うとエラーになる

[geckotang]

READMEに記載されているサンプルで edit-server したところエラーが表示されました。

エラー文次のとおりです。

> PROJECT_NAME@0.0.0 start /Users/geckotang/Work/PROJECT_NAME
> npm run edit-server


> PROJECT_NAME@0.0.0 edit-server /Users/geckotang/Work/PROJECT_NAME
> screen-spec-md edit-server -m ./markdown -d ./_spec

>>> publishing pages...
[1/1] /Users/geckotang/Work/PROJECT_NAME/_spec/index.html
>>> publishing tree...
>>> pages published!
<<< tree published!
All done :D
/Users/geckotang/Work/PROJECT_NAME/node_modules/viz.js/full.render.js:7
var Module=typeof Module!=="undefined"?Module:{};var moduleOverrides={};var key;for(key in Module){if(Module.hasOwnProperty(key)){moduleOverrides[key]=Module[key]}}Module["arguments"]=[];Module["thisProgram"]="./this.program";Module["quit"]=(function(status,toThrow){throw toThrow});Module["preRun"]=[];Module["postRun"]=[];var ENVIRONMENT_IS_WEB=false;var ENVIRONMENT_IS_WORKER=false;var ENVIRONMENT_IS_NODE=false;var ENVIRONMENT_IS_SHELL=false;if(Module["ENVIRONMENT"]){if(Module["ENVIRONMENT"]==="WEB"){ENVIRONMENT_IS_WEB=true}else if(Module["ENVIRONMENT"]==="WORKER"){ENVIRONMENT_IS_WORKER=true}else if(Module["ENVIRONMENT"]==="NODE"){ENVIRONMENT_IS_NODE=true}else if(Module["ENVIRONMENT"]==="SHELL"){ENVIRONMENT_IS_SHELL=true}else{throw new Error("Module['ENVIRONMENT'] value is not valid. must be one of: WEB|WORKER|NODE|SHELL.")}}else{ENVIRONMENT_IS_WEB=typeof window==="object";ENVIRONMENT_IS_WORKER=typeof importScripts==="function";ENVIRONMENT_IS

Error: listen EADDRINUSE: address already in use :::3001
    at Server.setupListenHandle [as _listen2] (net.js:1300:14)
    at listenInCluster (net.js:1348:12)
    at Server.listen (net.js:1436:7)
    at Function.listen (/Users/geckotang/Work/PROJECT_NAME/node_modules/express/lib/application.js:618:24)
    at start (/Users/geckotang/Work/PROJECT_NAME/node_modules/screen-spec-md/server/edit-server.js:23:22)
    at startEditServer (/Users/geckotang/Work/PROJECT_NAME/node_modules/screen-spec-md/server/edit-server.js:50:3)
    at processTicksAndRejections (internal/process/task_queues.js:93:5)
    at async Object.exports.handler (/Users/geckotang/Work/PROJECT_NAME/node_modules/screen-spec-md/bin/commands/edit-server.js:19:3)
Emitted 'error' event on Server instance at:
    at emitErrorNT (net.js:1327:8)
    at processTicksAndRejections (internal/process/task_queues.js:80:21) {
  code: 'EADDRINUSE',
  errno: 'EADDRINUSE',
  syscall: 'listen',
  address: '::',
  port: 3001
}
npm ERR! code ELIFECYCLE
npm ERR! errno 7
npm ERR! PROJECT_NAME@0.0.0 edit-server: `screen-spec-md edit-server -m ./markdown -d ./_spec`
npm ERR! Exit status 7
npm ERR!
npm ERR! Failed at the PROJECT_NAME@0.0.0 edit-server script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:
npm ERR!     /Users/geckotang/.npm/_logs/2019-11-28T02_30_19_229Z-debug.log
npm ERR! code ELIFECYCLE
npm ERR! errno 7
npm ERR! PROJECT_NAME@0.0.0 start: `npm run edit-server`
npm ERR! Exit status 7
npm ERR!
npm ERR! Failed at the PROJECT_NAME@0.0.0 start script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:
npm ERR!     /Users/geckotang/.npm/_logs/2019-11-28T02_30_19_250Z-debug.log

uispecを動かす際に、ポートの3001番は使用していませんでした。

おそらくviz.jsのエラーが原因だろうと思い、mdファイルからuiflowsの部分の記述を削除したところ、サーバーが立ち上がりました。

ディレクトリの状況

drwxr-xr-x geckotang staff   192 B  Thu Nov 28 11:32:23 2019   _spec
drwxr-xr-x geckotang staff    96 B  Thu Nov 28 11:29:39 2019   markdown
drwxr-xr-x geckotang staff  23.9 KB Thu Nov 28 11:23:28 2019   node_modules
.rw-r--r-- geckotang staff 503.6 KB Thu Nov 28 11:23:29 2019   package-lock.json
.rw-r--r-- geckotang staff   706 B  Thu Nov 28 11:29:28 2019   package.json
.rw-r--r-- geckotang staff   957 B  Thu Nov 28 11:17:18 2019   README.md
drwxr-xr-x geckotang staff    96 B  Thu Nov 28 11:28:51 2019   spec

Nodeのバージョン

[geckotang]$ node -v
v12.13.0