EikonError: Error code 500 | Backend error. Failed to deserialize backend response. Expected valid J

owilliams
owilliams
in Eikon Data APIs

I used to be able to query the the get_news_headlines() method using the below string formatting. But since this year I have been getting this error, while using the same code. I can't figure out a way to amend the query and still get the desired results.

From what I can see it seems to be encoding the backslashs in a way that makes the query unusable. It did not used to do this. Are you aware of any changes that were made that might cause this, and any solutions?


Code:

fo_all_str = "(\\\"Platts FO\\\" AND \\\"SELLS\\\" AND \\\"190\\\") OR (\\\"Platts FO\\\" AND \\\"BUYS\\\" AND \\\"190\\\") OR (\\\"Platts Marine\\\" AND \\\"SELLS\\\" AND \\\"190\\\") OR (\\\"Platts Marine\\\" AND \\\"BUYS\\\" AND \\\"190\\\")"

fo_headlines = ek.get_news_headlines(fo_all_str, count=100, date_from='2021-05-14T01:00:00', date_to='2021-06-08T23:59:00')


Full Error Message:

EikonError: Error code 500 | Backend error. Failed to deserialize backend response. Expected valid JSON. Error: invalid character 'i' looking for beginning of value

Tagged:

Best Answer

  • Alex Putkov.1
    Alex Putkov.1
    Answer ✓

    @owilliams

    It looks like the latest version of Eikon Data APIs library v1.1.10 has the same problem as the eikon module in RDP Library. Can you downgrade the version of Eikon Data APIs library to v1.1.6.post3 by running

    pip install eikon==1.1.6.post3

Answers

  • nick.zincone
    nick.zincone

    Hi @owilliams,

    There may have been a temporary issue with the server. Can you try again?

    This is what happened when I tried just now:

    image

  • owilliams
    owilliams

    Tried again, using Python3 version 3.7 and 3.8 and get the same result. It has been doing this to me for months now. May I ask what python version you are using? Not sure how to resolve this now that I see that it is working for you.

  • owilliams
    owilliams

    Please find below the full error traceback, if it helps:


    2021-06-09 21:06:33,123 P[33412] [MainThread 23108] Backend error. Failed to deserialize backend response. Expected valid JSON. Error: invalid character 'i' looking for beginning of value

    2021-06-09 21:06:33,124 P[33412] [MainThread 23108] HTTP request failed: EikonError-Backend error. Failed to deserialize backend response. Expected valid JSON. Error: invalid character 'i' looking for beginning of value

    Traceback (most recent call last):

    File "C:\Users\ODW_W\anaconda3\envs\eikon_test\lib\site-packages\eikon\json_requests.py", line 124, in send_json_request

    _check_server_error(result)

    File "C:\Users\ODW_W\anaconda3\envs\eikon_test\lib\site-packages\eikon\json_requests.py", line 216, in _check_server_error

    raise EikonError(int(server_response['ErrorCode']), error_message)

    eikon.eikonError.EikonError: Error code 500 | Backend error. Failed to deserialize backend response. Expected valid JSON. Error: invalid character 'i' looking for beginning of value

    During handling of the above exception, another exception occurred:

    Traceback (most recent call last):

    File "<input>", line 1, in <module>

    File "C:\Program Files\JetBrains\PyCharm Community Edition with Anaconda plugin 2019.1.2\plugins\python-ce\helpers\pydev\_pydev_bundle\pydev_umd.py", line 197, in runfile

    pydev_imports.execfile(filename, global_vars, local_vars) # execute the script

    File "C:\Program Files\JetBrains\PyCharm Community Edition with Anaconda plugin 2019.1.2\plugins\python-ce\helpers\pydev\_pydev_imps\_pydev_execfile.py", line 18, in execfile

    exec(compile(contents+"\n", file, 'exec'), glob, loc)

    File "C:/Users/ODW_W/Documents/GitHub/motools/odw_tools/reports/sing_report.py", line 37, in <module>

    fo_headlines = ek.get_news_headlines(fo_all_str, count=100, date_from='2021-05-14T01:00:00', date_to='2021-06-08T23:59:00')

    File "C:\Users\ODW_W\anaconda3\envs\eikon_test\lib\site-packages\eikon\news_request.py", line 124, in get_news_headlines

    result = eikon.json_requests.send_json_request(News_Headlines_UDF_endpoint, payload, debug=debug)

    File "C:\Users\ODW_W\anaconda3\envs\eikon_test\lib\site-packages\eikon\json_requests.py", line 134, in send_json_request

    raise EikonError(eikon_err.code, eikon_err.message)

    eikon.eikonError.EikonError: Error code 500 | Backend error. Failed to deserialize backend response. Expected valid JSON. Error: invalid character 'i' looking for beginning of value

  • Alex Putkov.1
    Alex Putkov.1

    @owilliams

    Are you using Eikon Data APIs library or eikon module from RDP Library? In other words do you use

    import eikon as ek

    or

    import refinitiv.dataplatform.eikon as ek

    As far as I can see the problem you experienced is specific to eikon module in RDP Library. I don't reproduce it with Eikon Data APIs library. For this reason I suggest you use Eikon Data APIs library to retrieve news headlines from Eikon while we're working on addressing the problem in RDP Library.

  • owilliams
    owilliams

    I've been using: import eikon as ek

    I used pip to install eikon. I've tried a fresh installation and still get the same error.


    I'm not familiar with the RDP library, or how to install that module.

  • nick.zincone
    nick.zincone

    Hi @owilliams,

    Have you tried running your example in CodeBook? Just want to confirm you can get a valid answer back there so we can try to work backwards. You also mentioned this has been doing this for months now. Has it ever worked?

  • owilliams
    owilliams

    Thank you, that version seems to work fine for me.

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