WXComponentFactory error type:[indexitem] class not found

in file ./weex/android/playground/app/src/main/java/com/alibaba/weex/WXMainActivity.java
change line from

private static String CURRENT_IP="your_current_IP"; // your_current_IP

to

private static String CURRENT_IP="192.168.31.240"; // your_current_IP

occur

04-24 01:09:37.495 12641-12675/com.alibaba.weex E/weex: WXComponentFactory error type:[indexitem] class not found

in logcat

and I can get page title(Weex HTML5) from http://192.168.31.240:12580/ in my browser(UC) by the same phone.

the git branch is 5439a0b

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