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unexpected error

when i start the experiment it works until suddenly in the middle it stops and pops up an unexpected error.
that's what i get: Unexpected error

item-stack: experiment[run].experimental_loop[run].block_sequence_1[run].block_loop_1[run].trail_sequence[prepare].word_1[prepare]
exception message: unsupported operand type(s) for -: 'unicode' and 'unicode'
time: Thu Feb 09 15:01:06 2017
exception type: TypeError
can someone help me with this cause i'm new to opensesame.


  • Hi Jamila,

    Welcome to the forum!

    Can you be more specific with your question? What is it that you want to present and how is your experiment structured?

    Based on the current information and exception message we can only guess what causes the error.


  • hi.
    the experiment is about lexical decision (word/non-word).
    i have four conditions in the block of the experiment: 1) word that appears on the left screen 2) appears on both sides and same two conditions for non-words.
    the thing is that i have 160 words in total, and when the experiment runs and reach approximately half way of the words, the experiment stops and i get the message that i mentioned before!

    thanks Laurent.

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