Exception when use android tabs with intent to start activity

I have an error when i use intent to start activity when i choose a tab

intent = new Intent().setClass(this, tab1.class);
mTabHost.addTab(mTabHost.newTabSpec("tab_test1").setIndicator("Search").setContent(intent));

the erroe is

Sorry !
The Application has stopped unexpe开发者_如何学Cctedly  , please try again later 

look here for a possible solution (this seems to be a common TabHost issue)

You've most likely not defined the classes (activities) you are trying to load in your AndroidManifest.xml.