[SOLVED] label on each segment pie chart

chart.labels().textFormatter("{%x}");
chart.labels().position("outside");

Uncaught TypeError: chart.labels(...).textFormatter is not a function
    at constructor.Runner.Charts.chartModifyHandlers.internodeCall (RunnerAll.js:73)
    at Object.setupChart (RunnerAll.js:64)
    at Object.success (RunnerAll.js:57)
    at j (loadfirst.js:1)
    at Object.fireWith [as resolveWith] (loadfirst.js:1)
    at x (loadfirst.js:1)
    at XMLHttpRequest.b (loadfirst.js:1)