Jenkins acceptance test Harness : Selenium grid issues

[ni n]

Hello all!

I am trying to run ATH using remotewebdriver, for that I have modified the FallbackConfig.java (at~/src/main/java/org/jenkinsci/test/acceptance/FallbackConfig.java) as following: 

case "remotewebdriver":
    DesiredCapabilities icaps = new DesiredCapabilities();
    icaps.setBrowserName("firefox");
    return new InfinityConnection().createWebDriver(icaps);

Moreover, I have created RemoteWebdriverConnection.java (at ~/src/main/java/org/jenkinsci/test/acceptance/utils/RemoteWebdriverConnection.java)

public class RemoteWebdriverConnection {
    public WebDriver createWebDriver (DesiredCapabilities icaps) throws MalformedURLException {
    return new RemoteWebDriver(new URL("HubURL:HubPort/wd/hub"), icaps);
  }
}

The above test setup runs perfectly on different selenium Hubs in my network (Multiple machines) when I simply create a hub and connect a node to it (Hub can be anywhere and node can be anywhere within my network) specify the browser.

However, it gives me an error (see below) when I specify additional capabilities on my mac mini which acts as a grid and the available browser is Firefox (Version 30 on Windows 8 64 bit)

case "remotewebdriver":
    DesiredCapabilities icaps = new DesiredCapabilities();
    icaps.setCapability("browser", "FIREFOX_30_WINDOWS_8_64");
    icaps.setCapability("email", "te...@mywebsite.com");
    icaps.setCapability("record", true);
 return new InfinityConnection().createWebDriver(icaps);

Stack trace for error: on hastebin

I cannot seem to understand where exactly is the Guice error, and what might be going wrong. I would be really grateful for  any guidance/suggestions!

Thank you very much in advance,

Greetings from Germany,