URL of experiment: https://pavlovia.org/run/Felix/helloworld_test/html/
Description of the problem: When running the experiment online, this message appears: TypeError: Attempted to assign to readonly property.
Solution: I’ve played around a bit and tried to isolate the problem. It appears that Pavlovia takes issue if the condition file has empty columns (e.g., one condition in column A, another in column C, leaving column B empty). For anyone encountering this issue, I’d suggest checking the condition file is formatted without empty columns.