org.openqa.selenium.SessionNotCreatedException with Appium

Issue

Now, I am a complete novice when it comes to Appium, and I am trying to launch a device and open an application on it. But when I run the code I get this error, now I am not at all sure what the issue is, maybe it has something to do with the Appium server but not sure how do I go about fixing it. Here is my code implementation.

    @Test
    public void myFirstAppiumTest() throws MalformedURLException {
        DesiredCapabilities capabilities = new DesiredCapabilities();
        capabilities.setCapability(MobileCapabilityType.APP, System.getProperty("user.dir") + "/ApiDemos-debug.apk");

        AndroidDriver<AndroidElement> driver = new AndroidDriver(new URL("http://127.0.0.1:4723/wd/hub"), capabilities);
    }
}

And here is the error that I am getting.

org.openqa.selenium.SessionNotCreatedException: Unable to create a new remote session. Please check the server log for more details. Original error: An unknown server-side error occurred while processing the command. Original error: Error getting device API level. Original error: Error executing adbExec. Original error: 'Command ''C:\\Users\\ABC\\AppData\\Local\\Android\\Sdk\\platform-tools\\adb.exe' -P 5037 -s emulator-5554 shell getprop ro.build.version.sdk' exited with code 1'; Stderr: 'adb.exe: device unauthorized.
This adb server's $ADB_VENDOR_KEYS is not set
Try 'adb kill-server' if that seems wrong.
Otherwise check for a confirmation dialog on your device.'; Code: '1'
Build info: version: '3.141.59', revision: 'e82be7d358', time: '2018-11-14T08:17:03'
System info: os.name: 'Windows 10', os.arch: 'amd64', os.version: '10.0', java.version: '1.8.0_312'
Driver info: driver.version: AndroidDriver
remote stacktrace: UnknownError: An unknown server-side error occurred while processing the command. Original error: Error getting device API level. Original error: Error executing adbExec. Original error: 'Command ''C:\\Users\\ABC\\AppData\\Local\\Android\\Sdk\\platform-tools\\adb.exe' -P 5037 -s emulator-5554 shell getprop ro.build.version.sdk' exited with code 1'; Stderr: 'adb.exe: device unauthorized.
This adb server's $ADB_VENDOR_KEYS is not set
Try 'adb kill-server' if that seems wrong.
Otherwise check for a confirmation dialog on your device.'; Code: '1'
    at getResponseForW3CError (C:\Users\ABC\AppData\Local\Programs\Appium Server GUI\resources\app\node_modules\appium\node_modules\appium-base-driver\lib\protocol\errors.js:804:9)
    at asyncHandler (C:\Users\ABC\AppData\Local\Programs\Appium Server GUI\resources\app\node_modules\appium\node_modules\appium-base-driver\lib\protocol\protocol.js:380:37)
Build info: version: '3.141.59', revision: 'e82be7d358', time: '2018-11-14T08:17:03'
System info: host: 'DESKTOP-R3JT7MO', ip: '192.168.0.103', os.name: 'Windows 10', os.arch: 'amd64', os.version: '10.0', java.version: '1.8.0_312'
Driver info: driver.version: AndroidDriver

    at io.appium.java_client.remote.AppiumCommandExecutor$1.createSession(AppiumCommandExecutor.java:216)
    at io.appium.java_client.remote.AppiumCommandExecutor.createSession(AppiumCommandExecutor.java:225)
    at io.appium.java_client.remote.AppiumCommandExecutor.execute(AppiumCommandExecutor.java:250)
    at org.openqa.selenium.remote.RemoteWebDriver.execute(RemoteWebDriver.java:552)
    at io.appium.java_client.DefaultGenericMobileDriver.execute(DefaultGenericMobileDriver.java:41)
    at io.appium.java_client.AppiumDriver.execute(AppiumDriver.java:1)
    at io.appium.java_client.android.AndroidDriver.execute(AndroidDriver.java:1)
    at org.openqa.selenium.remote.RemoteWebDriver.startSession(RemoteWebDriver.java:213)
    at io.appium.java_client.AppiumDriver.startSession(AppiumDriver.java:363)
    at org.openqa.selenium.remote.RemoteWebDriver.<init>(RemoteWebDriver.java:131)
    at io.appium.java_client.DefaultGenericMobileDriver.<init>(DefaultGenericMobileDriver.java:37)
    at io.appium.java_client.AppiumDriver.<init>(AppiumDriver.java:89)
    at io.appium.java_client.AppiumDriver.<init>(AppiumDriver.java:99)
    at io.appium.java_client.android.AndroidDriver.<init>(AndroidDriver.java:97)
    at AppiumDemoTests.myFirstAppiumTest(AppiumDemoTests.java:16)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:133)
    at org.testng.internal.TestInvoker.invokeMethod(TestInvoker.java:598)
    at org.testng.internal.TestInvoker.invokeTestMethod(TestInvoker.java:173)
    at org.testng.internal.MethodRunner.runInSequence(MethodRunner.java:46)
    at org.testng.internal.TestInvoker$MethodInvocationAgent.invoke(TestInvoker.java:824)
    at org.testng.internal.TestInvoker.invokeTestMethods(TestInvoker.java:146)
    at org.testng.internal.TestMethodWorker.invokeTestMethods(TestMethodWorker.java:146)
    at org.testng.internal.TestMethodWorker.run(TestMethodWorker.java:128)
    at java.util.ArrayList.forEach(ArrayList.java:1259)
    at org.testng.TestRunner.privateRun(TestRunner.java:794)
    at org.testng.TestRunner.run(TestRunner.java:596)
    at org.testng.SuiteRunner.runTest(SuiteRunner.java:377)
    at org.testng.SuiteRunner.runSequentially(SuiteRunner.java:371)
    at org.testng.SuiteRunner.privateRun(SuiteRunner.java:332)
    at org.testng.SuiteRunner.run(SuiteRunner.java:276)
    at org.testng.SuiteRunnerWorker.runSuite(SuiteRunnerWorker.java:53)
    at org.testng.SuiteRunnerWorker.run(SuiteRunnerWorker.java:96)
    at org.testng.TestNG.runSuitesSequentially(TestNG.java:1212)
    at org.testng.TestNG.runSuitesLocally(TestNG.java:1134)
    at org.testng.TestNG.runSuites(TestNG.java:1063)
    at org.testng.TestNG.run(TestNG.java:1031)
    at com.intellij.rt.testng.IDEARemoteTestNG.run(IDEARemoteTestNG.java:66)
    at com.intellij.rt.testng.RemoteTestNGStarter.main(RemoteTestNGStarter.java:109)
Caused by: java.lang.reflect.InvocationTargetException
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at io.appium.java_client.remote.AppiumCommandExecutor$1.createSession(AppiumCommandExecutor.java:193)
    
Caused by: org.openqa.selenium.WebDriverException: An unknown server-side error occurred while processing the command. Original error: Error getting device API level. Original error: Error executing adbExec. Original error: 'Command ''C:\\Users\\ABC\\AppData\\Local\\Android\\Sdk\\platform-tools\\adb.exe' -P 5037 -s emulator-5554 shell getprop ro.build.version.sdk' exited with code 1'; Stderr: 'adb.exe: device unauthorized.
This adb server's $ADB_VENDOR_KEYS is not set
Try 'adb kill-server' if that seems wrong.
Otherwise check for a confirmation dialog on your device.'; Code: '1'
Build info: version: '3.141.59', revision: 'e82be7d358', time: '2018-11-14T08:17:03'
System info: host: os.name: 'Windows 10', os.arch: 'amd64', os.version: '10.0', java.version: '1.8.0_312'
Driver info: driver.version: AndroidDriver
remote stacktrace: UnknownError: An unknown server-side error occurred while processing the command. Original error: Error getting device API level. Original error: Error executing adbExec. Original error: 'Command ''C:\\Users\\ABC\\AppData\\Local\\Android\\Sdk\\platform-tools\\adb.exe' -P 5037 -s emulator-5554 shell getprop ro.build.version.sdk' exited with code 1'; Stderr: 'adb.exe: device unauthorized.
This adb server's $ADB_VENDOR_KEYS is not set
Try 'adb kill-server' if that seems wrong.
Otherwise check for a confirmation dialog on your device.'; Code: '1'
    at getResponseForW3CError (C:\Users\ABC\AppData\Local\Programs\Appium Server GUI\resources\app\node_modules\appium\node_modules\appium-base-driver\lib\protocol\errors.js:804:9)
    at asyncHandler (C:\Users\ABC\AppData\Local\Programs\Appium Server GUI\resources\app\node_modules\appium\node_modules\appium-base-driver\lib\protocol\protocol.js:380:37)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
    at org.openqa.selenium.remote.W3CHandshakeResponse.lambda$errorHandler$0(W3CHandshakeResponse.java:62)
    at org.openqa.selenium.remote.HandshakeResponse.lambda$getResponseFunction$0(HandshakeResponse.java:30)
    at org.openqa.selenium.remote.ProtocolHandshake.lambda$createSession$0(ProtocolHandshake.java:126)
    at java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:193)
    at java.util.Spliterators$ArraySpliterator.tryAdvance(Spliterators.java:958)
    at java.util.stream.ReferencePipeline.forEachWithCancel(ReferencePipeline.java:126)
    at java.util.stream.AbstractPipeline.copyIntoWithCancel(AbstractPipeline.java:499)
    at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:486)
    at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:472)
    at java.util.stream.FindOps$FindOp.evaluateSequential(FindOps.java:152)
    at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
    at java.util.stream.ReferencePipeline.findFirst(ReferencePipeline.java:531)
    at org.openqa.selenium.remote.ProtocolHandshake.createSession(ProtocolHandshake.java:128)
    ```

Solution

You are getting following error as, Stderr: 'adb.exe: device unauthorized'. Can you please check with adb devices on terminal/ shell and verify if you are getting unauthorized status? If yes, please follow this link to get it resolved and then run your automated script again.

Answered By - Bipin Kumar Chaurasia