error message about promise && connection

[Sandy PIERRE]

Hi when i verify my answer for routing exercice i have this error:

/home/mnk/Documents/dev/nodeDev/koa/node_modules/koa/node_modules/co/index.js:88
if (ret.done) return Promise.resolve(ret.value);
^
ReferenceError: Promise is not defined
at next (/home/mnk/Documents/dev/nodeDev/koa/node_modules/koa/node_modules/co/index.js:88:26)
at onFulfilled (/home/mnk/Documents/dev/nodeDev/koa/node_modules/koa/node_modules/co/index.js:59:12)
at Object.co (/home/mnk/Documents/dev/nodeDev/koa/node_modules/koa/node_modules/co/index.js:44:10)
at Object. (/home/mnk/Documents/dev/nodeDev/koa/node_modules/koa/node_modules/co/index.js:28:15)
at Server. (/home/mnk/Documents/dev/nodeDev/koa/node_modules/koa/lib/application.js:123:8)
at Server.EventEmitter.emit (events.js:107:17)
at HTTPParser.parserOnIncoming as onIncoming
at HTTPParser.parserOnHeadersComplete (_http_common.js:111:23)
at Socket.socketOnData (_http_server.js:357:22)
at Socket.EventEmitter.emit (events.js:104:17)
✗ Error connecting to submission server(http://localhost:45317/404), options: {"timeout":5000,"maxRedirects":10}. Error: connect ECONNREFUSED
at exports._errnoException (util.js:745:11)
at Object.afterConnect as oncomplete

[Yiyu He]

please use node v0.11.13+, the latest version of koa need native Promise.

[Sandy PIERRE]

sorry i was in a long trip..thanks for your answer!!