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[open]Errno 13, logfile could not be opened

edited April 2013 in OpenSesame


I've been trying to run experiments on new laptops with 64-bit Win 7 System, which I previously programmed on 32-bit Win 7 system. When I double click the opensesame file, it appears the error message shown below:

The version installed is the newest one (0.27.1_win32). And the experiments are copied from the 32-bit system. I could not open it at all, even when the opensesame is open.

Is there something wrong with the system or software?




  • edited 3:31PM

    And the opensesame.exe.log notes the following:


    Two new laptops are installed with opensesame, one of them even doesn't have opensesame.exe.log...

  • edited 3:31PM

    Hi Ying,

    There are two issues here. The first is that OpenSesame doesn't have write access to its own folder. This is in itself not a problem, but it prevents OpenSesame from creating opensesame.exe.log when a crash occurs. This can be resolved by giving yourself write permission on the folder, or by running one of the portable versions.

    The second error is more mysterious. When does this error occur? And do you have OpenSesame installed in a folder that contains special characters?


  • edited May 2013

    Hello Sebastiaan,

    the second error occurs when I want to add new items like media_player_vlc to the experiment, there's nothing happening. So I close the program with a error message that I should check the logfile for details. And there's always this kind of messages:

    I have installed in a folder like C:\Users\username\Documents\OpenSesame. Although the system language is German, there is no special character in the folders.

    The software does not work at all on this system (Win 7, 64 bit), is this maybe a compatibility problem?



  • edited 3:31PM

    The software does not work at all on this system (Win 7, 64 bit), is this maybe a compatibility problem?

    In principle, no. Although the Windows packages are 32 bit, they should run fine on a 64 bit system. In fact, I build them on Win 7 64 bit.

    The first error message indicates that a) a plug-in failed to load and b) the error message couldn't be parsed. Part b) is probably due to special characters in the German error message (OpenSesame has come a long way, but still isn't fully Unicode safe). Part a) is more difficult to say. Does this happen with all items, or only when you try to insert a specific plug-in? The second error message is less clear, but it might be an indirect result of the first one, I'm not sure.

    I would try two things: First, update to 0.27.2 to see if the error message is still there in this version. If this update doesn't help (I actually doubt that it will), you can start OpenSesame in debug mode to get more useful error messages. You can do this by launching OpenSesame from a command prompt with the --debug parameter:

    opensesame.exe --debug

    Good luck!

  • edited 3:31PM

    Hi Sebastiaan,

    I've checked the plug-in. I found that the error only appears when I try to insert the media-player-VLC. The version of the VLC was for 64bit system. So I switched it into 32 bit. Now the OpenSesame works well. Thank you for your patience and warm-hearted reply every time!

    By the way, how can I change the font size of the text_screen item in questionnaire plug-in?

    Thanks again for your tips!


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