Goole play service issue

hello,
my project is working well in ios and android too.
when i have integrated admob ad it causes an error and don’t know why this is happening
see attached screenshot and provide me a solution as soon as possible
@slackmoehrle please check it

NoClassDefFoundError:org.cocos2dx.lib.Cocos2dxHelper

Can you double check this class Cocos2dxHelper ?

@nite Yes i already double check this class and already there.

@nite we are waiting for your response
i will provide a solution.

Can I take a look at your project?