App crashes soon as I launch

Hey guys, please help.
Fixed my code errors but then when I tried to run the app I got this:

/Users/TyTy/.meteor/packages/meteor-tool/.1.3.1.cqd94r++os.osx.x86_64+web.browser+web.cordova/mt-os.osx.x86_64/dev_bundle/server-lib/node_modules/fibers/future.js:267

throw(ex);

^

ReferenceError: Posts is not defined

at meteorInstall.lib.collections.posts.js (lib/collections/posts.js:3:1)

at fileEvaluate (packages/modules-runtime.js:158:9)

at require (packages/modules-runtime.js:92:16)

at /Users/TyTy/Workspace/pinnacle/.meteor/local/build/programs/server/app/app.js:171:1

at /Users/TyTy/Workspace/pinnacle/.meteor/local/build/programs/server/boot.js:283:10

at Array.forEach (native)

at Function..each..forEach (/Users/TyTy/.meteor/packages/meteor-tool/.1.3.1.cqd94r++os.osx.x86_64+web.browser+web.cordova/mt-os.osx.x86_64/dev_bundle/server-lib/node_modules/underscore/underscore.js:79:11)

at /Users/TyTy/Workspace/pinnacle/.meteor/local/build/programs/server/boot.js:133:5

Exited with code: 8

I don’t even know what to make of this.

Your collection Posts is not defined.