It's not work when generator with mongodb

[iepngs]

npm version: v3.7.3
node version: v5.9.0
it's my environment above, and there are all details message info with error:

➜ nodejs mkdir koat
➜ nodejs cd koat
➜ koat yo k

欢迎使用 k ！
k 是koa工程构建器，自带必备优秀的koa中间件。

? use db : mongodb
create config/config.js
create config/local.js
create view/index.xtpl
create view/layout/footer.xtpl
create view/layout/header.xtpl
create view/layout/layout.xtpl
create controller/index.js
create router/index.js
create test/index-router-spec.js
create package.json
create app.js

I'm all done. Running bower install & npm install for you to install the required dependencies. If this fails, try running the command yourself.

npm WARN deprecated native-or-bluebird@1.1.2: 'native-or-bluebird' is deprecated. Please use 'any-promise' instead.
npm WARN deprecated jade@0.26.3: Jade has been renamed to pug, please install the latest version of pug instead of jade
npm WARN deprecated graceful-fs@2.0.3: graceful-fs v3.0.0 and before will fail on node releases >= v7.0. Please update to graceful-fs@^4.0.0 as soon as possible. Use 'npm ls graceful-fs' to find it in the tree.
npm WARN prefer global coffee-script@1.10.0 should be installed with -g

kerberos@0.0.11 install /Users/iepngs/koat/node_modules/kerberos
(node-gyp rebuild 2> builderror.log) || (exit 0)

CXX(target) Release/obj.target/kerberos/lib/kerberos.o

bson@0.2.22 install /Users/iepngs/koat/node_modules/bson
(node-gyp rebuild 2> builderror.log) || (exit 0)

CXX(target) Release/obj.target/bson/ext/bson.o
koat@0.0.0 /Users/iepngs/koat
├── co@3.1.0
├─┬ co-urllib@0.2.3
│ ├── co-assert-timeout@0.0.5
│ ├─┬ co-readall@0.0.1
│ │ └─┬ readall@1.0.0
│ │ └── debug@0.7.4
│ ├── debug@0.8.1
│ ├── default-user-agent@0.0.1
│ ├── generator-supported@0.0.1
│ └── thunkify@2.1.2
├─┬ debug@2.0.0
│ └── ms@0.6.2
├─┬ koa@0.6.0
│ ├─┬ accepts@1.0.7
│ │ ├── mime-types@1.0.2
│ │ └── negotiator@0.4.7
│ ├── co@3.0.6
│ ├─┬ cookies@0.4.1
│ │ └── keygrip@1.0.1
│ ├── delegates@0.0.3
│ ├── dethroy@1.0.2
│ ├── error-inject@1.0.0
│ ├── escape-html@1.0.3
│ ├── finished@1.1.4
│ ├── fresh@0.2.4
│ ├── koa-compose@2.2.0
│ ├── koa-is-json@1.0.0
│ ├── only@0.0.2
│ ├─┬ set-type@1.0.1
│ │ └── mime@1.3.4
│ ├── statuses@1.0.4
│ └─┬ type-is@1.1.0
│ └── mime@1.2.11
├─┬ koa-bodyparser@1.3.0
│ ├─┬ co-body@1.0.0
│ │ ├── qs@1.0.2
│ │ └─┬ raw-body@1.1.7
│ │ ├── bytes@1.0.0
│ │ └── string_decoder@0.10.31
│ └── copy-to@2.0.1
├─┬ koa-compress@1.0.6
│ ├── bytes@0.3.0
│ └── compressible@1.1.1
├─┬ koa-generic-session@1.6.0
│ ├── crc@3.2.1
│ ├── parseurl@1.3.1
│ └─┬ uid-safe@1.0.3
│ ├── base64-url@1.2.0
│ └── native-or-bluebird@1.1.2
├─┬ koa-generic-session-mongo@0.1.1
│ ├── co-wrapper@0.0.2
│ └─┬ mongodb@1.4.40
│ ├─┬ bson@0.2.22
│ │ └── nan@1.8.4
│ ├── kerberos@0.0.11
│ └─┬ readable-stream@2.1.4
│ ├── buffer-shims@1.0.0
│ ├── core-util-is@1.0.2
│ ├── isarray@1.0.0
│ ├── process-nextick-args@1.0.7
│ └── util-deprecate@1.0.2
├─┬ koa-mongo@0.2.0
│ ├── debug@1.0.4
│ └── generic-pool@2.4.2
├─┬ koa-onerror@1.2.0
│ ├── copy-to@1.0.1
│ └─┬ swig@1.4.2
│ ├─┬ optimist@0.6.1
│ │ ├── minimist@0.0.10
│ │ └── wordwrap@0.0.3
│ └─┬ uglify-js@2.4.24
│ ├── async@0.2.10
│ ├─┬ source-map@0.1.34
│ │ └── amdefine@1.0.0
│ ├── uglify-to-browserify@1.0.2
│ └─┬ yargs@3.5.4
│ ├── camelcase@1.2.1
│ ├── decamelize@1.2.0
│ ├── window-size@0.1.0
│ └── wordwrap@0.0.2
├─┬ koa-router@3.4.0
│ ├── koa-compose@2.4.0
│ ├── methods@1.1.2
│ └─┬ path-to-regexp@1.5.0
│ └── isarray@0.0.1
├─┬ koa-static-cache@1.2.0
│ ├─┬ compressible@2.0.8
│ │ └── mime-db@1.23.0
│ ├── fs-readdir-recursive@1.0.0
│ └─┬ mime-types@2.0.14
│ └── mime-db@1.12.0
├─┬ koa-validator@0.6.3
│ ├─┬ jistype@0.1.0
│ │ └── coffee-script@1.10.0
│ └── validator@3.43.0
├── lru-cache@2.5.0
├─┬ mini-logger@1.0.0
│ ├── copy-to@1.0.1
│ ├─┬ error-formatter@1.0.5
│ │ └── utility@1.8.0
│ ├── iconv-lite@0.4.13
│ ├─┬ logfilestream@1.0.1
│ │ ├─┬ mkdirp@0.5.1
│ │ │ └── minimist@0.0.8
│ │ └── moment@2.8.4
│ └── sdk-base@1.0.1
├─┬ mocha@1.21.5
│ ├── commander@2.3.0
│ ├── diff@1.0.8
│ ├── escape-string-regexp@1.0.2
│ ├─┬ glob@3.2.3
│ │ ├── graceful-fs@2.0.3
│ │ ├── inherits@2.0.1
│ │ └─┬ minimatch@0.2.14
│ │ └── sigmund@1.0.1
│ ├── growl@1.8.1
│ ├─┬ jade@0.26.3
│ │ ├── commander@0.6.1
│ │ └── mkdirp@0.3.0
│ └─┬ mkdirp@0.5.0
│ └── minimist@0.0.8
├── should@3.3.2
├─┬ supertest@0.12.1
│ ├── methods@1.0.0
│ └─┬ superagent@0.18.0
│ ├── component-emitter@1.1.2
│ ├── cookiejar@1.3.2
│ ├── debug@0.7.4
│ ├── extend@1.2.1
│ ├─┬ form-data@0.1.2
│ │ ├─┬ combined-stream@0.0.7
│ │ │ └── delayed-stream@0.0.5
│ │ └── mime@1.2.11
│ ├── formidable@1.0.14
│ ├── methods@0.0.1
│ ├── mime@1.2.5
│ ├── qs@0.6.6
│ ├─┬ readable-stream@1.0.27-1
│ │ └── isarray@0.0.1
│ └── reduce-component@1.0.1
├── underscore@1.7.0
├── xtemplate@4.2.4
└── xtpl@3.1.9

npm WARN koat@0.0.0 No description
npm WARN koat@0.0.0 No repository field.
npm WARN koat@0.0.0 No license field.

➜ koat npm start

koat@0.0.0 start /Users/iepngs/koat
NODE_ENV=local DEBUG=koat node --harmony app.js

module.js:341
throw err;
^

Error: Cannot find module 'koa-sess-mongo-store'
at Function.Module._resolveFilename (module.js:339:15)
at Function.Module._load (module.js:290:25)
at Module.require (module.js:367:17)
at require (internal/module.js:16:19)
at Object. (/Users/iepngs/koat/app.js:42:18)
at Module._compile (module.js:413:34)
at Object.Module._extensions..js (module.js:422:10)
at Module.load (module.js:357:32)
at Function.Module._load (module.js:314:12)
at Function.Module.runMain (module.js:447:10)

npm ERR! Darwin 15.4.0
npm ERR! argv "/usr/local/Cellar/node/5.9.0/bin/node" "/usr/local/bin/npm" "start"
npm ERR! node v5.9.0
npm ERR! npm v3.7.3
npm ERR! code ELIFECYCLE
npm ERR! koat@0.0.0 start: NODE_ENV=local DEBUG=koat node --harmony app.js
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the koat@0.0.0 start script 'NODE_ENV=local DEBUG=koat node --harmony app.js'.
npm ERR! Make sure you have the latest version of node.js and npm installed.
npm ERR! If you do, this is most likely a problem with the koat package,
npm ERR! not with npm itself.
npm ERR! Tell the author that this fails on your system:
npm ERR! NODE_ENV=local DEBUG=koat node --harmony app.js
npm ERR! You can get information on how to open an issue for this project with:
npm ERR! npm bugs koat
npm ERR! Or if that isn't available, you can get their info via:
npm ERR! npm owner ls koat
npm ERR! There is likely additional logging output above.

npm ERR! Please include the following file with any support request:
npm ERR! /Users/iepngs/koat/npm-debug.log

then I did this:
npm install -g koa-sess-mongo-store
but it's also take error as above.., so how to resolve this problem? call for help