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Value Error Confusion

While running a backtest for an algo in the making, I received the following error:

ValueError: labels [ Equity(4246, symbol=u'KLAC', asset_name=u'KLA-TENCOR CORP', exchange=u'NASDAQ GLOBAL SELECT MARKET', start_date=Timestamp('1993-01-04 00:00:00+0000', tz='UTC'), end_date=Timestamp('2016-08-11 00:00:00+0000', tz='UTC'), first_traded=None, auto_close_date=Timestamp('2016-08-16 00:00:00+0000', tz='UTC'))] not contained in axis

Can someone point me towards a possible solution/ reason for this?

Thank you in advance!

Update: I believe I have solved the issue!