=> Started proxy.
=> Started MongoDB.
=> Started your app.
=> App running at: http://localhost:3100
I20160407-22:27:17.793(-3)? Exception in defer callback: TypeError: Arguments to path.join must be strings
I20160407-22:27:17.794(-3)? at path.js:360:15
I20160407-22:27:17.794(-3)? at Array.filter (native)
I20160407-22:27:17.794(-3)? at Object.exports.join (path.js:358:36)
I20160407-22:27:17.794(-3)? at Object.pathJoin (packages/velocity_meteor-internals.js:681:16)
I20160407-22:27:17.795(-3)? at Object.getTestsPath (/private/var/folders/lt/xtllnx7d6619n_4rf9pm8pf80000gn/T/meteor-test-run1hb4acl/.meteor/local/build/programs/server/packages/velocity_core.js:1425:44)
I20160407-22:27:17.795(-3)? at initFileWatcher (/private/var/folders/lt/xtllnx7d6619n_4rf9pm8pf80000gn/T/meteor-test-run1hb4acl/.meteor/local/build/programs/server/packages/velocity_core.js:1604:23)
I20160407-22:27:17.795(-3)? at initializeVelocity (/private/var/folders/lt/xtllnx7d6619n_4rf9pm8pf80000gn/T/meteor-test-run1hb4acl/.meteor/local/build/programs/server/packages/velocity_core.js:1364:11)
I20160407-22:27:17.795(-3)? at [object Object]..extend.withValue (packages/meteor.js:1100:17)
I20160407-22:27:17.795(-3)? at packages/meteor.js:445:45
I20160407-22:27:17.796(-3)? at runWithEnvironment (packages/meteor.js:1154:24)
I had this and it was because I still had one of the velocity reporter packages installed. See if you have anything pertaining to velocity and try removing it.
I removed but when I do any meteor command the velocity packages appears again in versions file.
Log
velocity:chokidar added, version 1.2.0_1
velocity:core added, version 0.10.10
velocity:meteor-internals added, version 1.1.0_7
velocity:meteor-stubs added, version 1.1.1
velocity:shim added, version 0.1.0
Versions file with velocity
velocity:chokidar@1.2.0_1
velocity:core@0.10.10
velocity:meteor-internals@1.1.0_7
velocity:meteor-stubs@1.1.1
velocity:shim@0.1.0