The constructor RemoteWebDriver(Capabilities) refers to the missing type Capabilities

I am using Appium for android.
I am trying to set DesiredCapabilities like this:

DesiredCapabilities capabilities = new DesiredCapabilities();
         capabilities.setCapability("BROWSER_NAME", "Android");
           capabilities.setCapability("platformName", "Android");
            capabilities.setCapability("deviceName", "Android");

capabilities.setCapability("appPackage","com.gauravdubey.gdlearning");  
            capabilities.setCapability("appActivity","com.gauravdubey.gdlearning.MainActivity");

(The lines below give the error - The constructor RemoteWebDriver(Capabilities) refers to the missing type Capabilities)

WebDriver driver=new RemoteWebDriver(new URL("http://ift.tt/1eWSHgW"),capabilities);

However the defintion asks for the same thing- one Url obejct and one of Desired Capabilities.
I cannot find what the exact problem is.