I defined a new variable 

Name        Value            Description
categories  (1, 2, 3, 4, 5)  my categories ids

and in my path i want to get a random value from categories: category_id=my_random_value.

I even tried this 

category_id=${__StringFromArrayAtRandomindex('1', '2', '3', '4', '5'}

but it doesn't work.

jmeter
Edit
Report