Can't swipe with Webview

i using Appium 1.4.3 and Simulator Iphone6 8.3. Convert Hybrid apps to web view and I can’t using TouchAction swipe

Error: [performTouchAction([{“action”:“press”,“options”:{“x”:1050,“y”:700}},{“action”:“wait”,“options”:{“ms”:500}},{“action”:“moveTo”,“options”:{“x”:50,“y”:700}},{“action”:“release”,“options”:{}}])] Error response status: 13, , UnknownError - An unknown server-side error occurred while processing the command. Selenium error: Not yet implemented. Please help us: http://appium.io/get-involved.html
at _stream_readable.js:908:16