Backtest stopped running

Hey Brian,

I was running a backtest on a strategy without problems but out of nowhere I started getting an error. Any idea what it could be?

HTTPError: (‘500 Server Error: INTERNAL SERVER ERROR for url: http://houston/zipline/backtests/12%%20Solution?data_frequency=daily&start_date=2008-1-15&end_date=2020-4-6&progress=M’, {‘status’: ‘error’, ‘msg’: ‘The truth value of a Series is ambiguous. Use a.empty, a.bool(), a.item(), a.any() or a.all().’})

Algorithm support isn’t available through the support forum, but as a general pointer, you need to check the detailed logs for the traceback, which will point you to the line number in your code causing the error, and you can troubleshoot from there.