working with two projects in android eclipse -

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i new android. doing 1 project let projecta in when button clicked, project b has run.i made project b library project , called launcher activity of project b in project button click.the app working fine until button click whenever button clicked 'unfortunately project has stopped'. coming noclassdeffounderror. searched in google tried solutions still not working. project b alone working fine , project without project b working fine.is there way directly run library project without calling launcher activity? please body me.


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