serenity-bdd/serenity-core

Hi - I am trying to get a RemoteWebDriver session to launch a new session on PerfectoMobile cloud and I keep getting error message as "Could not start a new session. Possible causes are invalid address of the remote server or browser start-up failure.". I checked the URLs, security info and other capabilities and everything looks fine.. Appreciate if you can assist.. Pasting the ProviderClass details here:
import java.net.URL;
import java.util.Iterator;

import org.openqa.selenium.Platform;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.remote.DesiredCapabilities;
import org.openqa.selenium.remote.RemoteWebDriver;

import net.thucydides.core.util.EnvironmentVariables;
import net.thucydides.core.util.SystemEnvironmentVariables;
import net.thucydides.core.webdriver.DriverSource;

public class PerfectoSerenityDriver implements DriverSource {

@Override
public WebDriver newDriver() {
    System.out.println("Initiating perfecto driver");
    EnvironmentVariables environmentVariables = SystemEnvironmentVariables.createEnvironmentVariables();


    try {
        DesiredCapabilities capabilities = new DesiredCapabilities("chrome", "", Platform.ANY);
        String host = "xxx.perfectomobile.com";
        String token = "test token code replaced with actual key";
        capabilities.setCapability("securityToken", token);
        capabilities.setCapability("platformName", "Windows");
        capabilities.setCapability("platformVersion", "10");
        capabilities.setCapability("browserName", "chrome");
        capabilities.setCapability("browserVersion", "87");
        capabilities.setCapability("location", "US East");
        capabilities.setCapability("resolution", "1280x1024");
        System.out.println("Capabilities set: " + capabilities);
       WebDriver driver = new RemoteWebDriver(new URL("https://" + host + "/nexperience/perfectomobile/wd/hub/fast"), capabilities);
    System.out.println("driver got initiated");
       return driver;
    }
    catch(Exception e){
        System.out.println("Problem initiating remote web session " + e.getMessage());
        return null;
    }
}

@Override

public boolean takesScreenshots() {
return true;
}
}

Error exception:
Problem initiating remote web session Could not start a new session. Possible causes are invalid address of the remote server or browser start-up failure.
Build info: version: '3.141.59', revision: 'e82be7d358', time: '2018-11-14T08:17:03'
System info: host: 'xxxxxxx', ip: 'yyyyyyy', os.name: 'Windows 10', os.arch: 'amd64', os.version: '10.0', java.version: '1.8.0_191'
Driver info: driver.version: PerfectoSerenityDriver
Given User login into SFDC as ADMIN # starter.stepdefinitions.commonStepDefination.user_login_into_SFDC_as_ADMIN()
net.serenitybdd.core.exceptions.SerenityManagedException
at org.junit.Assert.fail(Assert.java:86)
at org.junit.Assert.fail(Assert.java:95)
at wfm_PageObjects.LoginPage.loginSalesforce(LoginPage.java:60)
at wfm_PageObjects.LoginPage$ByteBuddy$wm46uLWS.loginSalesforce$accessor$v6mXo8Ji(Unknown Source)
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 net.thucydides.core.steps.BaseMethodRunner.invokeMethod(BaseMethodRunner.java:18)
at net.thucydides.core.steps.NormalMethodRunner.invokeMethodAndNotifyFailures(NormalMethodRunner.java:18)
at net.thucydides.core.steps.StepInterceptor.runNormalMethod(StepInterceptor.java:394)
at net.thucydides.core.steps.StepInterceptor.testStepResult(StepInterceptor.java:179)
at net.thucydides.core.steps.StepInterceptor.intercept(StepInterceptor.java:77)
at wfm_PageObjects.LoginPage$ByteBuddy$wm46uLWS.loginSalesforce(Unknown Source)
at starter.stepdefinitions.commonStepDefination.user_login_into_SFDC_as_ADMIN(commonStepDefination.java:48)