Hello I keep getting this error

Runtime Error

"During the algorithm initialization, the following exception has occurred: AttributeError : type object 'Resolution' has no attribute 'minute'"

When trying to pass the resolution step in equities

class BootCampTask(QCAlgorithm):

    def Initialize(self):
        self.SetStartDate(2017, 6, 1)
        self.SetEndDate(2017, 6, 15)
        # Manually Select Data     
        self.spy = self.AddEquity("SPY", Resolution.Minute)
        self.iwm = self.AddEquity("IWM", Resolution.Minute)
    def OnData(self, data):


This is what Im entering, I checked the solution, it's the same yet I keep getting that error that I meantioned