Custom script not working on custom roles

Hi guys,

We have created a client script on a Custom record. The script breaks down a group item to its component items line by line, as does in standard items' table in opportunity record on that custom sublist/table (Pre-Sales Estimations Custom record). The script works only while using the administrator and it doesn't work in any custom role. We have added all the required permission on the custom roles regarding custom scripts, custom records etc. but still the script returns the below error:

Could someone assist how to resolve this error?

Thanks,

Elina.