Error: Call to a possibly undefined method UpButton

[moondigi]

3.2.16

/flowplayer/core/build.properties

plugin-classes=${plugins.dir}/controls/src/actionscript ${lib.dir}/common/src/actionscript ${plugins.dir}/bitrateselect/src/actionscript
plugin-swc=${plugins.dir}/controls/src/flash ${plugins.dir}/bitrateselect/src/flash

/flowplayer/core/src/actionscript-builtin/BuiltInConfig.as

package {
    import org.flowplayer.controls.Controls;
    import org.flowplayer.bitrateselect.BitrateSelectPlugin;

    public class BuiltInConfig {
        private var controls:org.flowplayer.controls.Controls;
        private var bitrateselect:org.flowplayer.bitrateselect.BitrateSelectPlugin;

        public static const config:Object = {
        }
    }
}

BUILD FAILED

when i removed bitrateselect

package {
    import org.flowplayer.controls.Controls;

    public class BuiltInConfig {
        private var controls:org.flowplayer.controls.Controls;

        public static const config:Object = {
        }
    }
}

BUILD SUCCESSFUL