Pavlovia: TypeError: "undefined" is read-only

Hi all,

Everything was working find in my online experiment but I recently made some slight adjustments to an Excel file containing my practice or training phase stimuli.

I get this error just before I get to this part of the program: TypeError: “undefined” is read-only
and assume it’s connected. I’ve reverted back to the old file, removed and re-added the additional resources, deleted unneeded columns in Excel and even moved the cursor to a box containing text (these all seemed to be suggested based on this error from the forum), but nothing has resolved it.

It’s a bit confusing because everything was working perfectly before.

Any suggestions?

Thanks in advance


THPN-1-Practice-21.xlsx (9.2 KB)

hi @bornslippy , are you still having trouble with this issue?
I’d be happy to take a look if you can make the experiment available

Thanks, I figured it out in the end by reverting back to the original file.