Adding Custom logic to existing controls

Hi,

I am following this https://academy.creatio.com/documents/technic-sdk/7-16/how-add-custom-logic-existing-controls article to add custom logic.

below is my conf object for the diff array : 

I have followed the instruction as it is given in the article but when I save the schema and clear the cache, the record pages show a blank workspace. When I comment the above config object of diff array the records opens but I can't able to achieve the task.

Please Help me to figure the problem ! 

Many thanks,

Best