problem in creating web API where data is driven from expression rule

problem in creating web API where data is driven from expression rulehttps://community.appian.com/discussions/f/new-to-appian/18688/problem-in-creating-web-api-where-data-is-driven-from-expression-ruleHi, I am new to appian .I created a web API to download csv template using expression rule where expression rule is fetching data from data store point. Here i am facing problem for setting rule data in web API. Please find the code below a!localVariablesen-USTelligent Community 12