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401 error in a ranking task

  1. 02-20-2011, 6:17 AM#1
    ancadranca

    401 error in a ranking task

    Hi,

    I'm having subjects rank some items in a timed ranking task. The .exp file has a (d-120) parameter. However, I've had 3 participants whose medialab file simply crashed. The error read: can't show non-modal form when modal form is displayed. Additionally, no data was saved up until that moment.
    Could you tell me why this is happening and what I can do to prevent it?

    Thank you,
    Anca
  2. 02-22-2011, 4:38 PM#2
    jarvis24 Blair Jarvis, Administrator
    If the error occurs only sometimes, then I would first ask if you have any other simultaneous timers going--e.g., for the que file where it is listed in the experiment (.exp) file. Also--are you able to replicate the crash if you test run the questionnaire on its own within MediaLab? Finally, what version of MediaLab is this (i.e., v20xx.x.x)?
  3. 02-22-2011, 4:58 PM#3
    ancadranca
    Hi!

    I read the previous post about the double timed questionnaire embedded in the .exp file, but no, I do not have. Also, I tried replicating the crash on my own computer, then on the University computers where it had happened, but I could not.
    The version is V2008.1.13.

    Anca
  4. 02-23-2011, 8:12 AM#4
    jarvis24 Blair Jarvis, Administrator
    Any chance you could zip and attach a copy of your experiment folder?
  5. 02-23-2011, 8:49 AM#5
    ancadranca
    Hi!
    I attached the experiment. The crash occurs when participants reach trial.exp, more specifically, as one told me, when she ran out of time. So far it happened only in conditions 5& 6.
    Let me know if there is something unclear.
    Thank you!

    Anca
  6. 03-08-2011, 4:22 PM#6
    jarvis24 Blair Jarvis, Administrator
    Anca--you've found a bug I believe. I was able to replicate the error under the following condition: I allowed the time to run out on the ranking item *while* one of the other message boxes was open--i.e., either "Move all the items" or the "Instructions" message boxes. Basically resulting in 2 message boxes being open at once. Subsequently, closing one caused the error. Any chance you could confirm this causes the error on your end?
  7. 03-08-2011, 4:27 PM#7
    jarvis24 Blair Jarvis, Administrator
    Another thought--just curious--did you ever try to time the ranking item *within* a questionnaire (as opposed to it being a single item within a timed questionnaire)?
  8. 03-09-2011, 4:59 AM#8
    ancadranca
    Hi Jarvis,

    I also successfully replicated the crash in the lab! So thank you for finding the bug. Also, yes, I included 1 more item in all ranking questionnaires, but that did not change anything. Although I'm not sure if this is your question....because I thought I need to time the .que in the .exp file for the time clock to appear.

    Regards,
    Anca