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KeyError help?

Sorry in advance for the newbie question. Just getting my feet wet with the platform and experimenting.

I created a simple algorithm to get my feet wet, and it runs fine in the backtester but when I loaded into the contest for submission I got this error:

The error occurred on line(s) 27 with the high-level message, KeyError: 'mix_twitter'.

This was during market hours (not sure if that's a factor)

I just tried to submit the same algo to the contest just now after market hours (again not sure if that's a factor just want to state the facts) and got no such error.

Can anyone explain what might be going on?

Thanks!

Clone Algorithm
2
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Backtest from to with initial capital
Total Returns
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Alpha
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Beta
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Sharpe
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Sortino
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Max Drawdown
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Benchmark Returns
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Volatility
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Returns 1 Month 3 Month 6 Month 12 Month
Alpha 1 Month 3 Month 6 Month 12 Month
Beta 1 Month 3 Month 6 Month 12 Month
Sharpe 1 Month 3 Month 6 Month 12 Month
Sortino 1 Month 3 Month 6 Month 12 Month
Volatility 1 Month 3 Month 6 Month 12 Month
Max Drawdown 1 Month 3 Month 6 Month 12 Month
# Backtest ID: 55affde6ff8c9e0c654b4f91
There was a runtime error.
1 response

Looks like you ran into an error with Fetcher - it doesn't look backwards in the file. When you launched the algo, it looked for data today (7/22/2015), but it didn't find the data and crashed. To fix this, you can increment your data forward by one business day to begin live trading.

Cheers,
Alisa

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