TypeError: Cannot read property ‘disconnect’ of null
at [object Object]. (/Applications/Appium.app/Contents/Resources/node_modules/appium/lib/devices/ios/ios-controller.js:1670:26)
at [object Object]. (/Applications/Appium.app/Contents/Resources/node_modules/appium/lib/devices/ios/ios-controller.js:1683:9)
at [object Object].iOSController.setContext (/Applications/Appium.app/Contents/Resources/node_modules/appium/lib/devices/ios/ios-controller.js:1698:7)
at exports.setContext (/Applications/Appium.app/Contents/Resources/node_modules/appium/lib/server/controller.js:1023:16)
at Layer.handle [as handle_request] (/Applications/Appium.app/Contents/Resources/node_modules/appium/node_modules/express/lib/router/layer.js:82:5)
at next (/Applications/Appium.app/Contents/Resources/node_modules/appium/node_modules/express/lib/router/route.js:110:13)
at Route.dispatch (/Applications/Appium.app/Contents/Resources/node_modules/appium/node_modules/express/lib/router/route.js:91:3)
at Layer.handle [as handle_request] (/Applications/Appium.app/Contents/Resources/node_modules/appium/node_modules/express/lib/router/layer.js:82:5)
at /Applications/Appium.app/Contents/Resources/node_modules/appium/node_modules/express/lib/router/index.js:267:22
at param (/Applications/Appium.app/Contents/Resources/node_modules/appium/node_modules/express/lib/router/index.js:340:14)
at param (/Applications/Appium.app/Contents/Resources/node_modules/appium/node_modules/express/lib/router/index.js:356:14)
at Function.proto.process_params (/Applications/Appium.app/Contents/Resources/node_modules/appium/node_modules/express/lib/router/index.js:400:3)
at next (/Applications/Appium.app/Contents/Resources/node_modules/appium/node_modules/express/lib/router/index.js:261:10)
at next (/Applications/Appium.app/Contents/Resources/node_modules/appium/node_modules/express/lib/router/route.js:100:14)
at next (/Applications/Appium.app/Contents/Resources/node_modules/appium/node_modules/express/lib/router/route.js:104:14)
at next (/Applications/Appium.app/Contents/Resources/node_modules/appium/node_modules/express/lib/router/route.js:104:14)
at next (/Applications/Appium.app/Contents/Resources/node_modules/appium/node_modules/express/lib/router/route.js:104:14)
at next (/Applications/Appium.app/Contents/Resources/node_modules/appium/node_modules/express/lib/router/route.js:104:14)
at next (/Applications/Appium.app/Contents/Resources/node_modules/appium/node_modules/express/lib/router/route.js:104:14)
at next (/Applications/Appium.app/Contents/Resources/node_modules/appium/node_modules/express/lib/router/route.js:104:14)
at next (/Applications/Appium.app/Contents/Resources/node_modules/appium/node_modules/express/lib/router/route.js:104:14)
at next (/Applications/Appium.app/Contents/Resources/node_modules/appium/node_modules/express/lib/router/route.js:104:14)
at next (/Applications/Appium.app/Contents/Resources/node_modules/appium/node_modules/express/lib/router/route.js:104:14)
at next (/Applications/Appium.app/Contents/Resources/node_modules/appium/node_modules/express/lib/router/route.js:104:14)
at exports.sessionBeforeFilter (/Applications/Appium.app/Contents/Resources/node_modules/appium/lib/server/controller.js:56:5)
at Layer.handle [as handle_request] (/Applications/Appium.app/Contents/Resources/node_modules/appium/node_modules/express/lib/router/layer.js:82:5)
at next (/Applications/Appium.app/Contents/Resources/node_modules/appium/node_modules/express/lib/router/route.js:110:13)
at next (/Applications/Appium.app/Contents/Resources/node_modules/appium/node_modules/express/lib/router/route.js:104:14)
at next (/Applications/Appium.app/Contents/Resources/node_modules/appium/node_modules/express/lib/router/route.js:104:14)
at next (/Applications/Appium.app/Contents/Resources/node_modules/appium/node_modules/express/lib/router/route.js:104:14)
at next (/Applications/Appium.app/Contents/Resources/node_modules/appium/node_modules/ex
info: <-- POST /wd/hub/session/5a20eec3-3aca-465a-805a-2c4e1082f806/context 500 2.642 ms - 95