Javascript Meteor upload无法读取属性'；contentType'；未定义的

我真的按照教程中的路线在线，上传达到100%后，我得到一个503服务不可用。js控制台日志说/upload缺失，但我不知道这是什么意思

 render.change file: IMG_4180.JPG
uploader.js:167 render.add 
jquery.js:9659 POST http://treehacks.cloudapp.net:3000/upload 503 (Service Unavailable)
uploader.js:200 render.fail 
uploader.js:82 data.sumbit.fail: Unexpected error. 503 Service Unavailable
uploader.js:85 data.sumbit.always:  textStatus= error
sockjs-0.3.4.js:854 GET http://treehacks.cloudapp.net:3000/sockjs/info?cb=on9gi8aoej 503 (Service Unavailable)
sockjs-0.3.4.js:854 GET http://treehacks.cloudapp.net:3000/sockjs/info?cb=esmeje0lui 503 (Service Unavailable)
sockjs-0.3.4.js:854 GET http://treehacks.cloudapp.net:3000/sockjs/info?cb=us0wyblu2e 503 (Service Unavailable)

同时，服务器崩溃，只在之后提供错误页面。在服务器日志上，我得到

W20150222-01:49:32.150(0)? (STDERR) app/meteor.js:57
W20150222-01:49:32.159(0)? (STDERR)           return formData.contentType;
W20150222-01:49:32.159(0)? (STDERR)                          ^
W20150222-01:49:32.264(0)? (STDERR) TypeError: Cannot read property 'contentType' of undefined
W20150222-01:49:32.275(0)? (STDERR)     at Object.UploadServer.init.getDirectory (app/meteor.js:57:23)
W20150222-01:49:32.275(0)? (STDERR)     at IncomingForm.<anonymous> (packages/tomi:upload-server/upload_server.js:326:1)
W20150222-01:49:32.275(0)? (STDERR)     at IncomingForm.emit (events.js:98:17)
W20150222-01:49:32.275(0)? (STDERR)     at /home/treehacks/.meteor/packages/tomi_upload-server/.1.2.1.uqdd2s++os+web.browser+web.cordova/npm/node_modules/formidable/lib/incoming_form.js:228:12
W20150222-01:49:32.276(0)? (STDERR)     at WriteStream.<anonymous> (/home/treehacks/.meteor/packages/tomi_upload-server/.1.2.1.uqdd2s++os+web.browser+web.cordova/npm/node_modules/formidable/lib/file.js:70:5)
W20150222-01:49:32.276(0)? (STDERR)     at WriteStream.g (events.js:180:16)
W20150222-01:49:32.276(0)? (STDERR)     at WriteStream.emit (events.js:117:20)
W20150222-01:49:32.284(0)? (STDERR)     at finishMaybe (_stream_writable.js:359:12)
W20150222-01:49:32.286(0)? (STDERR)     at afterWrite (_stream_writable.js:279:5)
W20150222-01:49:32.286(0)? (STDERR)     at onwrite (_stream_writable.js:269:7)
W20150222-01:49:32.286(0)? (STDERR)     at WritableState.onwrite (_stream_writable.js:96:5)

W20150222-01:49:32.150（0）？（STDERR）app/meteor.js:57
W20150222-01:49:32.159（0）？（STDERR）返回formData.contentType；
W20150222-01:49:32.159（0）？（标准）^
W20150222-01:49:32.264（0）？（STDERR）TypeError:无法读取未定义的属性“contentType”
W20150222-01:49:32.275（0）？（STDERR）位于Object.UploadServer.init.getDirectory（app/meteor.js:57:23）
W20150222-01:49:32.275（0）？（标准）以收入形式。（packages/tomi:upload server/upload_server.js:326:1）
W20150222-01:49:32.275（0）？（STDERR）位于IncomingForm.emit（events.js:98:17）
W20150222-01:49:32.275（0）？（STDERR）at/home/treehacks/.meteor/packages/tomi_upload-server/.1.2.1.uqdd2s++os+web.browser+web.cordova/npm/node_modules/fordable/lib/incoming_form.js:228:12
W20150222-01:49:32.276（0）？（STDERR）在WriteStream。（/home/treehacks/.meteor/packages/tomi_upload-server/.1.2.1.uqdd2s++os+web.browser+web.cordova/npm/node_modules/fordable/lib/file.js:70:5）
W20150222-01:49:32.276（0）？（STDERR）位于WriteStream.g（events.js:180:16）
W20150222-01:49:32.276（0）？（STDERR）位于WriteStream.emit（events.js:117:20）
W20150222-01:49:32.284（0）？（STDERR）在finishMaybe（_stream_writable.js:359:12）
W20150222-01:49:32.286（0）？（STDERR）在后写时（_stream_writable.js:279:5）
W20150222-01:49:32.286（0）？（STDERR）在onwrite（_stream_writable.js:269:7）
W20150222-01:49:32.286（0）？（STDERR）位于writeablestate.onwrite（_stream_writeable.js:96:5）

我遇到了同样的问题。有人知道怎么解决吗？对我来说，

{>dropzone contentType='images'fileTypes='.jpg'multiple=true formData=specififormdata}

工作正常，但在

{>upload\u bootstrap}方面有问题