Hi Sanghee,
1. I don’t see the “Maximum call stack size exceeded” message, but regarding your image issue: what should happen after you show it? Right now, you tell the script to do nothing, that is, it moves to the next trial immediately after showing the image. Maybe you want to insert a Button or a Key element and wait for it
1-bis. Relatedly, you do not .print your Button named “webcamStart” so it’s not visible on the page, and the experiment gets stuck there, waiting for a click on an undisplayed button
2. PennController has been deprecated since version 1.7
3. Since new projects now ship with PennController 2.1, in which the EyeTracker element has been overhauled, it’s hard to speak from experience. However, I would say start with low-ish thresholds (say 20-30) and see if you get decent data. If not, try increasing it and see if you still pass calibration
4. If using version 2.1, note that the call command on the Function element has been replaced with run. Then try adding this line just before the Selector element: ()=>(document.querySelector("body").style.cursor='unset')
Best,
Jeremy