fatal: reference is not a tree: bb88c673a6b005d81f19cc86fa03b456a750d164

[kylecannon]

Kyles-Mac-Pro:magento kyle$ git submodule update --init
Submodule 'lib/Vehicle-Fits-Core' (https://github.com/vehiclefits/Vehicle-Fits-Core.git) registered for path 'lib/Vehicle-Fits-Core'
Cloning into 'lib/Vehicle-Fits-Core'...
remote: Counting objects: 1348, done.
remote: Compressing objects: 100% (514/514), done.
remote: Total 1348 (delta 791), reused 1335 (delta 778)
Receiving objects: 100% (1348/1348), 837.89 KiB | 420 KiB/s, done.
Resolving deltas: 100% (791/791), done.
fatal: reference is not a tree: bb88c673a6b005d81f19cc86fa03b456a750d164
Unable to checkout 'bb88c673a6b005d81f19cc86fa03b456a750d164' in submodule path 'lib/Vehicle-Fits-Core'

looks like you didn't push the latest version of the core.

[joshribakoff]

Pushed it