"Automation Status" is not a field in my test cases. Is it a custom field in your project?
Assuming Automation Status is a custom field, you need to find the name of the actual field in the database. This would be available by going to Tools > Customize > Project Entities. Then expand Test > User Fields and find the field you named Automation Status. The screen will show you the Name of the field, which will be something like TS_USER_01. Substitute that Name valu in where you have "TS_AutomationStatus" in your code.
(Opinions and information contained in this post are wholly my own and do not reflect the opinions of my employer.)