This error suddenly started occurring on BlackBerry projects that worked a week ago, can't think of what could have changed in the past week. The error doesn't happen when I'm working on Android projects.
I've checked similar questions on the site and the path and classpath variables are fine. I also updated to the latest Java SDK, just in case something got messed up. I'm running Windows 7 (x64), Eclipse (x64) and Java (x64).
Here's the error log entry
java.version=1.7.0_05
java.vendor=Oracle Corporation
BootLoader constants: OS=win32, ARCH=x86_64, WS=win32, NL=en_CA
Command-line arguments: -os win32 -ws win32 -arch x86_64
Error Tue Jul 10 00:53:40 EDT 2012 An internal error occurred during: "Launching UAV Coverage (1)".
java.lang.NoClassDefFoundError: com/android/sdklib/xml/ManifestData
at net.rim.ajde.internal.launch.BlackBerryAndroidLaunchConfigDelegate.startLaunch(BlackBerryAndroidLaunchConfigDelegate.java:425)
at net.rim.ajde.internal.launch.BlackBerryAndroidLaunchConfigDelegate.run(BlackBerryAndroidLaunchConfigDelegate.java:326)
at net.rim.ajde.internal.launch.BlackBerryAndroidLaunchConfigDelegate.launch(BlackBerryAndroidLaunchConfigDelegate.java:308)
at org.eclipse.debug.internal.core.LaunchConfiguration.launch(LaunchConfiguration.java:854)
at org.eclipse.debug.internal.core.LaunchConfiguration.launch(LaunchConfiguration.java:703)
at org.eclipse.debug.internal.ui.DebugUIPlugin.buildAndLaunch(DebugUIPlugin.java:937)
at org.eclipse.debug.internal.ui.DebugUIPlugin$8.run(DebugUIPlugin.java:1141)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:54)
Caused by: java.lang.ClassNotFoundException: com.android.sdklib.xml.ManifestData
at org.eclipse.osgi.internal.loader.BundleLoader.findClassInternal(BundleLoader.java:513)
at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:429)
at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:417)
at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.loadClass(DefaultClassLoader.java:107)
at java.lang.ClassLoader.loadClass(ClassLoader.java:356)
... 8 more
Thanks Rob