原始错误：io.appium.uiautomator2.common.exceptions.UiAutomator2Exception

Question

• Getting unknown server-side error while running the script.
• The script would terminate while scrolling else it would work fine.

Log error:

org.openqa.selenium.WebDriverException: An unknown server-side error occurred while processing the command. Original error: io.appium.uiautomator2.common.exceptions.UiAutomator2Exception: java.lang.IllegalStateException: UiAutomation not connected!
    at io.appium.uiautomator2.utils.UiExpressionParser.invokeMethod(UiExpressionParser.java:251)
    at io.appium.uiautomator2.utils.UiScrollableParser.consumeMethodCall(UiScrollableParser.java:124)
    at io.appium.uiautomator2.utils.UiScrollableParser.parse(UiScrollableParser.java:60)
    at io.appium.uiautomator2.utils.UiAutomatorParser.consumeStatement(UiAutomatorParser.java:93)
    at io.appium.uiautomator2.utils.UiAutomatorParser.parse(UiAutomatorParser.java:49)
    at io.appium.uiautomator2.utils.LocationHelpers.toSelectors(LocationHelpers.java:95)
    at io.appium.uiautomator2.utils.LocationHelpers.toSelector(LocationHelpers.java:88)
    at io.appium.uiautomator2.handler.FindElement.findElement(FindElement.java:144)
    at io.appium.uiautomator2.handler.FindElement.safeHandle(FindElement.java:75)
    at io.appium.uiautomator2.handler.request.SafeRequestHandler.handle(SafeRequestHandler.java:37)
    at io.appium.uiautomator2.server.AppiumServlet.handleRequest(AppiumServlet.java:250)
    at io.appium.uiautomator2.server.AppiumServlet.handleHttpRequest(AppiumServlet.java:241)
    at io.appium.uiautomator2.http.ServerHandler.channelRead(ServerHandler.java:44)
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:366)
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:352)
    at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:345)
    at io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:102)
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:366)
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:352)

* **Element info:

{Using=-android uiautomator, value=new UiScrollable(new UiSelector()).scrollIntoView(new UiSelector().text(" val "));}

Appium Log:

Answer 1

restarting adb before the test run with adb kill-server; adb start-server adb kill-server; adb start-server . because sometimes the appium server having issue with adb so by restarting you can avoid this problem not every time when this error comes you can again start executing if not solved then please restart adb and then start executing script that will work.. Happy to help... In case you have any doubts comment down below..