Wikitude

Error with WitudeSDK Plugin API

I am trying to use the wikitude sdk plugin to receive call when the Camera frames are available and when Update is called

But i am getting the below error..

java.lang.ClassNotFoundException: Didn't find class "com.wikitude.common.plugins.RecognizedTarget" on path: DexPathList

            at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)

            at java.lang.ClassLoader.loadClass(ClassLoader.java:511)

            at java.lang.ClassLoader.loadClass(ClassLoader.java:469)

            at com.wikitude.common.rendering.internal.NativeRenderer.onDrawFrame(Native Method)

            at com.wikitude.common.rendering.internal.b.onDrawFrame(GLRenderer.java)

            at ledscanner.demo.se.com.ledscannerdemo.GLRenderer.onDrawFrame(GLRenderer.java:24)

            at android.opengl.GLSurfaceView$GLThread.guardedRun(GLSurfaceView.java:1522)

            at android.opengl.GLSurfaceView$GLThread.run(GLSurfaceView.java:1239)

    Suppressed: java.lang.ClassNotFoundException: com.wikitude.common.plugins.RecognizedTarget

            at java.lang.Class.classForName(Native Method)

            at java.lang.BootClassLoader.findClass(ClassLoader.java:781)

            at java.lang.BootClassLoader.loadClass(ClassLoader.java:841)

            at java.lang.ClassLoader.loadClass(ClassLoader.java:504)

            ... 6 more

     Caused by: java.lang.NoClassDefFoundError: Class not found using the boot class loader; no stack available

 

any idea what is going wrong?

 

I am creating a simple plugin class in java (android) inherited from wikitude sdk plugin class "com.wikitude.common.plugins.Plugin"