does anyone know whats going on with this??? i've been working all day T_T

KeyError : 'value'

can't load my backtest yet. here's the code. 

        history = self.History(["AUDUSD", "USDSGD"], 200, Resolution.Daily)["value"].unstack(level=0).dropna()
        hist_one_year = history[-252:]
        X = hist_one_year["AUDUSD"][:, np.newaxis]
        y = hist_one_year["USDSGD"]
        self.regr = linear_model.LinearRegression()
        self.regr.fit(X, y)

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