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On this page, http://devcenter.kinvey.com/rest/reference/business-logic/reference.html#logger-module , it shows that the logger module has a method "warning". That method does not exist. Using it returns:
Justin Noel
{"error":"BLRuntimeError","description":"TheBusinessLogicscripthasaruntimeerror.Seedebugmessagefordetails.","debug":"TypeError:Object[objectObject]hasnomethod'warning'"}
The correct method is simply "warn":
logger.warn('Some crazy problem!');