When in package but not app: "Arguments to path.join must be strings"

[gadicc]

As per @clayne11 in #100 (comment):

=> Your application has errors. Waiting for file change.
=> Modified -- restarting.
METEOR_HOME for os.osx.x86_64                /
/Users/clayne/.meteor
name
gadicc:ecmascript-hot
version
undefined
=> Errors prevented startup:

   While loading plugin `compile-ecmascript-hot` from package `gadicc:ecmascript-hot`:
   path.js:360:15: Arguments to path.join must be strings
   at path.js:360:15
   at Array.filter (native)
   at Object.exports.join (path.js:358:36)
   at findPackagePath (packages/gadicc_hot-build/hot-server.js:98:1)
   at getPluginPath (packages/gadicc_hot-build/hot-server.js:106:1)
   at new Hot (packages/gadicc_hot-build/hot-server.js:149:1)
   at Package (packages/compile-ecmascript-hot/plugin.js:4:1)
   at <runJavaScript-100>:58:4
   at <runJavaScript-100>:65:3

OK I was able to solve this - I had implied gadicc:ecmascript-hot in a Meteor package because when I was testing I was flipping back and forth between ecmascript and gadicc:ecmascript-hot. I was able to fix it by actually adding gadicc:ecmascript-hot directly to the app, not just implying it in a package.