Getting issue during running a appium server

Support
1

import org.openqa.selenium.remote.DesiredCapabilities;

import io.appium.java_client.android.AndroidDriver;

public class Calculator {

static AndroidDriver driver;

public static void main(String[]args) {
try {

	openCalculator();
}catch(Exception exp) 
{
	System.out.println(exp.getCause());
	System.out.println(exp.getMessage());
	exp.printStackTrace();
}
} 
  public static void openCalculator() throws MalformedURLException {
  DesiredCapabilities cap=new DesiredCapabilities();
  cap.setCapability("deviceName","vivo 1951");
  cap.setCapability("udid", "95d9ce8b");
  cap.setCapability("platformName","Android");
  cap.setCapability("platformVersion","9");
  cap.setCapability("appPackage","com.android.bbkcalculator");
  cap.setCapability("appActivity","com.android.bbkcalculator.calculator");
URL url=new URL(" http://127.0.0.1:4723/wd/hub");
  driver=new AndroidDriver(url, cap);

System.out.println(“Application Started…”);
}
}

2

java.lang.reflect.InvocationTargetException
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: Could not find ‘aapt.exe’ in [“C:\Users\Mahesh\Downloads\sdk-tools-windows-4333796\platform-tools\aapt.exe”,“C:\Users\Mahesh\Downloads\sdk-tools-windows-4333796\emulator\aapt.exe”,“C:\Users\Mahesh\Downloads\sdk-tools-windows-4333796\tools\aapt.exe”,“C:\Users\Mahesh\Downloads\sdk-tools-windows-4333796\tools\bin\aapt.exe”]. Do you have Android Build Tools installed at ‘C:\Users\Mahesh\Downloads\sdk-tools-windows-4333796’?
Build info: version: ‘3.141.59’, revision: ‘e82be7d358’, time: ‘2018-11-14T08:17:03’
System info: host: ‘DESKTOP-AKCG72J’, ip: ‘10.136.3.198’, os.name: ‘Windows 10’, os.arch: ‘amd64’, os.version: ‘10.0’, java.version: ‘1.8.0_231’
Driver info: driver.version: AndroidDriver
remote stacktrace: UnknownError: An unknown server-side error occurred while processing the command. Original error: Could not find ‘aapt.exe’ in [“C:\Users\Mahesh\Downloads\sdk-tools-windows-4333796\platform-tools\aapt.exe”,“C:\Users\Mahesh\Downloads\sdk-tools-windows-4333796\emulator\aapt.exe”,“C:\Users\Mahesh\Downloads\sdk-tools-windows-4333796\tools\aapt.exe”,“C:\Users\Mahesh\Downloads\sdk-tools-windows-4333796\tools\bin\aapt.exe”]. Do you have Android Build Tools installed at ‘C:\Users\Mahesh\Downloads\sdk-tools-windows-4333796’?
at getResponseForW3CError (C:\Program Files\Appium\resources\app\node_modules\appium\node_modules\appium-base-driver\lib\protocol\errors.js:804:9)
at asyncHandler (C:\Program Files\Appium\resources\app\node_modules\appium\node_modules\appium-base-driver\lib\protocol\protocol.js:388:37)
at process._tickCallback (internal/process/next_tick.js:68:7)
Build info: version: ‘3.141.59’, revision: ‘e82be7d358’, time: ‘2018-11-14T08:17:03’
System info: host: ‘DESKTOP-AKCG72J’, ip: ‘10.136.3.198’, os.name: ‘Windows 10’, os.arch: ‘amd64’, os.version: ‘10.0’, java.version: ‘1.8.0_231’
Driver info: driver.version: AndroidDriver
at io.appium.java_client.remote.AppiumCommandExecutor$1.createSession(AppiumCommandExecutor.java:208)
at io.appium.java_client.remote.AppiumCommandExecutor.createSession(AppiumCommandExecutor.java:217)
at io.appium.java_client.remote.AppiumCommandExecutor.execute(AppiumCommandExecutor.java:239)
at org.openqa.selenium.remote.RemoteWebDriver.execute(RemoteWebDriver.java:552)
at io.appium.java_client.DefaultGenericMobileDriver.execute(DefaultGenericMobileDriver.java:41)