' undefined is not an object' when trying to change colour of stimulus

Online experiments
1

URL of experiment: Pavlovia

Description of the problem:

I’m trying to run a Corsi task online, where white blocks on the screen flash red in sequences outlined in a condition file. The current error message I’m getting is:

  • TypeError: undefined is not an object (evaluating ‘currBlock.fillColor = new util.Color(‘red’)’)

It is referring to the following lines:

    let currBlockName = sequence[blkIndex];
    currBlock = blocks[currBlockName];
    currBlock.fillColor = new util.Color('red');
    currBlock.lineColor = new util.Color('red');

Where sequence refers to a list of arrays in the conditions file, blocks is a dictionary and blkIndex is initially set at 0. This part works if I predefine a particular sequence (e.g sequence = [‘blk1’, ‘blk2’, ‘blk3’] in the code, so I’m thinking it is an issue with reading the conditions file?

Any help at all with this would be greatly appreciated!

Thanks,
Sam

2

Hey Sam,

I’d guess so too. To get a better grasp of what’s going wrong, try logging some info to the console, so you know what happens after each statement. See this demo: Thomas Pronk / tutorial_js_console_log · GitLab

Cheers Thomas