Job Monitor Widget: TypeError: jobTableList.item(0) has no properties

I have tried to implement the Job Monitor widget. I followed the blog instructions and also I changed the main.js with the RFC name ZBP_JOB_SELECT_SM37B.

I am getting the following error:

TypeError: jobTableList.item(0) has no properties (Global/onLoad:Logics/main.js: Line 157)