problems resolutions

This section lists the major errors that you may encounter.

Launch application error

Error message:

Ant build C:/Documents and Settings/rmxc7111/Desktop/eclipse/configuration/org.eclipse.osgi/bundles/322/1/.cp/WidgetSDK/build.xml already in progress. Concurrent Ant builds are possible if you specify to build in a separate JRE.

Solution:
Emulator is already launched.
Close the Emulator and relaunch your application.

MeMo Player doesn't support MovieTexture and AudioClip nodes

Error message:

     [java] MyCanvas:run exception during scene start: java.lang.NullPointerException
     [java] error MIDlet caught java.lang.NullPointerException
     [java] java.lang.NullPointerException
     [java] 	at memoplayer.Group.start(Unknown Source)
     [java] 	at memoplayer.Scene.start(Unknown Source)
     [java] 	at memoplayer.MyCanvas.play(Unknown Source)
     [java] 	at memoplayer.MyCanvas.run(Unknown Source)
     [java] 	at java.lang.Thread.run(Thread.java:619)
     [java] 	at org.microemu.app.util.MIDletThread.run(MIDletThread.java:99)
     [java] error MIDlet caught java.lang.NullPointerException
     [java] java.lang.NullPointerException
     [java] 	at memoplayer.Group.compose(Unknown Source)
     [java] 	at memoplayer.Scene.innerCompose(Unknown Source)
     [java] 	at memoplayer.Scene.compose(Unknown Source)
     [java] 	at memoplayer.MyCanvas.play(Unknown Source)
     [java] 	at memoplayer.MyCanvas.run(Unknown Source)
     [java] 	at java.lang.Thread.run(Thread.java:619)
     [java] 	at org.microemu.app.util.MIDletThread.run(MIDletThread.java:99)
     [java] Main loop: Exception caught: java.lang.NullPointerException

Solution:
There is a lot of optionnal VRML node or javascript API. So there is different MeMo Player versions, some of them includes the bare minimum to have a tiny player. Some other includes some optionnal nodes. With SDK, default MeMo Player doesn't support MovieTexture and AudioClip nodes.
You can change the MeMoPlayer version depending on your project needs (optimisation, multimedia, ...).
To change the MeMo Player, add following line in your app.properties file.

player.name=OWP