Yet another error which kept me busy since 1 hr… FrameMarkers sample from Vuforia SDK didn’t work because of a recent update in the adt 17… Same error happened as on this link and same solution:

http://android.foxykeep.com/dev/how-to-fix-the-classdefnotfounderror-with-adt-17

OR another solution: Go to Project Properties-> Java Build Path. From the Order and Export tab, make sure that the checkbox next to QCAR library is selected.

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