Hi

I'm trying to build my own custom jQuery but although I strictly followed the instructions in the README I get a "Warning" and when I --force the build process it doesn't work either.

MacBook Pro with:

grunt-cli v0.1.13
grunt v0.4.2
git version 2.4.5
node version v0.12.5

e.g. running

grunt custom:-ajax

results in:

grunt custom:-ajax
Running "custom:-ajax" (custom) task
Creating custom build...

Running "build:all:*:-ajax" (build) task
-ajax
-ajax/jsonp
-ajax/load
-ajax/parseJSON
-ajax/parseXML
-ajax/script
-ajax/var/nonce
-ajax/var/rquery
-ajax/xhr
-manipulation/_evalUrl
-event/ajax
Warning: TypeError: Cannot read property '1' of null
at Object.convert [as onBuildWrite]
jquery/build/tasks/build.js:49:77
Use --force to continue.

I was trying to build a custom version of jquery on a different machine (2015 iMac) and I get the same warning...

Any ideas what I'm doing wrong?
Thanks in advance!