Error for sample code

[victorconan]

When changing the sample code's year from 2016 to 2015, as below.

stock = Stock('AAPL')

period = 'quarterly' # or 'annual', which is the default
year = 2015 # can use default of 0 to get the latest
quarter = 1 # 1, 2, 3, 4, or default value of 0 to get the latest
# using defaults to get the latest annual, can simplify to stock.get_filing()
filing = stock.get_filing(period, year, quarter)

# financial reports (contain data for multiple years)
income_statements = filing.get_income_statements()
balance_sheets = filing.get_balance_sheets()
cash_flows = filing.get_cash_flows()

will get the below error:

cik for AAPL is 320193
getting ['10-Q', '10-Q/A'] filing info from https://www.sec.gov/Archives/edgar/full-index/2015/QTR1/master.idx
Processing SGML at https://www.sec.gov/Archives/edgar/data/320193/0001193125-15-023697.txt

AttributeError: 'DocumentText' object has no attribute 'xml'