Started with the SpineBoy example, deleted the jump and head animations, leaving only the walk animation. When exporting to binary and trying to setup the skeleton in libGDX, it fails with the following error
Exception in thread "LWJGL Application" java.lang.IndexOutOfBoundsException: index can't be >= size: 3 >= 1
at com.badlogic.gdx.utils.Array.get(Array.java:127)
at com.esotericsoftware.spine.SkeletonBinary.readAnimation(SkeletonBinary.java:311)
at com.esotericsoftware.spine.SkeletonBinary.readSkeletonData(SkeletonBinary.java:157)
at com.x.y.Main.init(Main.java:541)
at com.x.y.Main.render(Main.java:161)
at com.badlogic.gdx.backends.lwjgl.LwjglApplication.mainLoop(LwjglApplication.java:208)
at com.badlogic.gdx.backends.lwjgl.LwjglApplication$1.run(LwjglApplication.java:115)
Seems like the number of animations isn't properly updated. Using JSON, it works like expected.