FAILED CONFIGURATION: @BeforeTest startDriver org.openqa.selenium.SessionNotCreatedException:

ERROR

FAILED CONFIGURATION: @BeforeTest startDriver
 org.openqa.selenium.SessionNotCreatedException: A new session could not be created. (Original error: No app set; either start appium with --app or pass in an 'app' value in desired capabilities, or set androidPackage to launch pre-existing app on device) (WARNING: The server did not provide any stacktrace information)
 Command duration or timeout: 828 milliseconds
 Build info: version: '2.53.0', revision: '35ae25b', time: '2016-03-15 16:57:40'
 System info: host: 'HSNMM-KhyatiS', ip: '10.50.33.63', os.name: 'Windows 7', os.arch: 'amd64', os.version: '6.1', java.version: '1.7.0_79'

Driver info: io.appium.java_client.android.AndroidDriver
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at org.openqa.selenium.remote.ErrorHandler.createThrowable(ErrorHandler.java:206)
at org.openqa.selenium.remote.ErrorHandler.throwIfResponseFailed(ErrorHandler.java:158)
at org.openqa.selenium.remote.RemoteWebDriver.execute(RemoteWebDriver.java:678)
at io.appium.java_client.AppiumDriver.execute(AppiumDriver.java:180)
at org.openqa.selenium.remote.RemoteWebDriver.startSession(RemoteWebDriver.java:249)
at org.openqa.selenium.remote.RemoteWebDriver.(RemoteWebDriver.java:131)
at org.openqa.selenium.remote.RemoteWebDriver.(RemoteWebDriver.java:158)
at io.appium.java_client.AppiumDriver.(AppiumDriver.java:109)
at io.appium.java_client.android.AndroidDriver.(AndroidDriver.java:39)
at mweb.TestBasic.startDriver(TestBasic.java:37)

Solution

Make sure JDK is well installed in your system.
Check testng version is compatible with the selenium version you are using.
Check testng version is compatible with the appium version you are using.
Check selenium version is compatible with the appium version you are using.
Try killing all the instances of the selenium webdriver object if running. Check from task manager–> processes.
Check the instantiation of object driver is happening once while executing a single script or a stand alone test.
Check you have added selenium-server-standalone-X.XX.jar not the selenium-java-X.XX.jar. Or if you are using maven/gradle or any other build tool then check you have added selenium-server-standalone-X.XX dependency in your build file.