I have a store backed by syncstorage, and the load event isn't firing, whether I call store.load() or set autoLoad to true. If I do this before Ext.io.Io.init, then I get no errors.

If I try to call load in the callback of Ext.io.Io.init, then I get the following error:
TypeError: Cannot call method 'getFields' of undefined

How should I be loading stores? What's going on here?