I am using Quantopian Research Notebook, which is awesome! Everything runs fine until this Monday (2015-12-21), I try to run the exactly the SAME Notebook as before, but it generates a lot HTTPError: 500 Server Error: INTERNAL SERVER ERROR when the get_fundamentals API is called.

The PROBLEM is caused by using query( ).filter(fundamentals.company_reference.primary_symbol.in_(stock_list)) for ONLY SOME set of stock_list, for example, in the following code segment:

import datetime  
today = datetime.datetime.now().strftime('%Y-%m-%d')  
fundamentals = init_fundamentals()

good_list = ['AAPL', 'F', 'BABA', 'GE', 'KMI']

bad_list = ['CBD', 'MCI', 'WIT', 'SID', 'GFA', 'ERIC', 'ITUB', 'BWIN_A', 'RBPA_A']

stock_list = bad_list

fund_test_1 = get_fundamentals(  
    query(fundamentals.valuation_ratios.pe_ratio,  
          fundamentals.valuation.market_cap)  
          .filter(fundamentals.company_reference.primary_symbol.in_(stock_list)),  
          today, '5q')

fund_test_1

#############

# `.filter(fundamentals.company_reference.primary_symbol == stock_symbol)` ALSO CAUSE the same `HTTPError` for SOME `stock_symbol`

stock_symbol = 'CBD' # OR ANY symbol in above `bad_list`  
fund_test_2 = get_fundamentals(  
    query(fundamentals.valuation_ratios.pe_ratio,  
          fundamentals.valuation.market_cap)  
          .filter(fundamentals.company_reference.primary_symbol == stock_symbol),  
          today, '5q')

fund_test_2  

1. stock_list = good_list: everything just fine.
   
2. stock_list = bad_list: then HTTPError: 500 Server Error: INTERNAL SERVER ERROR will occur.
   
3. stock_list = good_list + bad_list: HTTPError won't occur, BUT fund_test_1.minor_axis will only contains those in good_list.

Acctually the bad_list is very long when I was testing, I only list a few here.

This is a VERY strange error because I didn't change anything of my Notebook, it was running without any problem before. But when I re-run the Notebook this week, the error happens.

Please let me know what happens here and how to fix the problem. Thanks!