Included in build path under Eclipse, will not compile

What steps will reproduce the problem?
1. Open project in Eclipse
2. Create folder in project called lib, drop jar library inside
3. Refresh files, right click AndroidBluetoothAPI_0.3b1.jar, select build
path -> add to build path

What is the expected output? What do you see instead?
Expected result is clean compile. I get this error:

java.lang.IllegalArgumentException: already added:
Landroid/bluetooth/IBluetoothDeviceCallback$Stub$Proxy;
[2009-10-08 22:06:31 - HelloAndroid]    at
com.android.dx.dex.file.ClassDefsSection.add(ClassDefsSection.java:123)
[2009-10-08 22:06:31 - HelloAndroid]    at
com.android.dx.dex.file.DexFile.add(DexFile.java:143)
[2009-10-08 22:06:31 - HelloAndroid]    at
com.android.dx.command.dexer.Main.processClass(Main.java:299)
[2009-10-08 22:06:31 - HelloAndroid]    at
com.android.dx.command.dexer.Main.processFileBytes(Main.java:276)

What version of the product are you using? On what operating system?
Using AndroidBluetoothAPI_0.3b1.jar, on Gentoo OS.

Please provide any additional information below.

1.5 SDK

Original issue reported on code.google.com by john5...@gmail.com on 9 Oct 2009 at 5:18

kb4beast / android-bluetooth

Included in build path under Eclipse, will not compile #9