Error code after deleting empty columns

[wakecarter]

Where is your cursor?

TypeError: Cannot assign to read only property 'undefined' of object '#'

URL of experiment: Files · master · Khor Khai Ling / SART · GitLab (pavlovia.org) Description of the problem: There is an error stated: " TypeError: Cannot assign to read only property ‘undefined’ of object ‘#’ when I try to run the experiment. I had checked my condition files and there is no empty cell as below: first condition file: [image] 2nd condition file: [image] I hope anyone could help me with this error.