use grunt build erro

[Beyondcg]

the erro info is:
Uncaught Error: [$injector:modulerr] Failed to instantiate module ncApp due to:
Error: [$injector:modulerr] Failed to instantiate module angular-sly due to:
Error: [$injector:nomod] Module 'angular-sly' is not available! You either misspelled the module name or forgot to load it. If registering a module ensure that you specify the dependencies as the second argument.

I use the yeoman generator-angular grunt