title: AppKey cannot be null or empty
body: <p>I am trying to develope an android ecommerce UI for demo. I downloaded the template files from this source at github <a href="https://github.com/Appdynamics/ECommerce-Android" rel="nofollow">https://github.com/Appdynamics/ECommerce-Android</a>. When I run the application in android studio everything builds fine but when I go to open the app on my emulator it crashes with this error message in the logcat</p>
  
  <pre><code> java.lang.RuntimeException: Unable to create application com.appdynamics.demo.android.CustomApplication: java.lang.IllegalArgumentException: AppKey cannot be null or empty
  </code></pre>
  
  <p>I think the problem is coming from this line of code by I'm not sure how to fix it </p>
  
  <pre><code>public class CustomApplication extends Application {
  
  
  @Override
  @InfoPoint
  public void onCreate() {
      super.onCreate();
      setGlobalData();
      Instrumentation.start(GlobalDataProvider.getInstance().getEumAppKey(),
              getApplicationContext(),
              GlobalDataProvider.getInstance().getCollectorUrl(),
              true);
  </code></pre>
  
  <p>Here is the preferences.xml file</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android"       android:title="@string/action_settings"&gt;
  &lt;EditTextPreference android:key="pref_rest_uri"    android:title="@string/pref_rest_uri"
  /&gt;&lt;!-- android:defaultValue="http://192.168.31.117:8000/appdynamicspilot/"--&gt;pref_eum_eum_app_key
  &lt;EditTextPreference android:key="pref_eum_app_key" android:title="@string/pref_eum_app_key"/&gt;
  &lt;EditTextPreference android:title="@string/pref_eum_collector_url" android:key="pref_eum_collector_url"/&gt;
  
  
  &lt;/PreferenceScreen&gt;
  </code></pre>
  
  <p>Any input would be greatly appreciated thanks. </p>