How fix Osmosis stopping with "Task type write-srtm doesn't exist"

Hi,

I am using your osmosis-srtm-plugin for my project, but I have encounter some problem, I download the Osmosis from http://wiki.openstreetmap.org/wiki/Osmosis, and put osmosis-srtm-plugin in lib/default, and run the command
osmosis.bat --read-xml map.osm --write-srtm srvBase=http://dds.cr.usgs.gov/srtm/version2_1/SRTM3/ srvSubDirs=North_America;South_America --write-xml test.osm followed http://code.google.com/p/osmosis-srtm-plugin/wiki/Examples.

However, the result is:
Aug 28, 2013 3:49:16 AM org.openstreetmap.osmosis.core.Osmosis run
INFO: Osmosis Version 0.43.1
Aug 28, 2013 3:49:16 AM org.openstreetmap.osmosis.core.Osmosis run
INFO: Preparing pipeline.
Aug 28, 2013 3:49:16 AM org.openstreetmap.osmosis.core.Osmosis main
SEVERE: Execution aborted.
org.openstreetmap.osmosis.core.OsmosisRuntimeException: Task type write-srtm doesn’t exist.
at org.openstreetmap.osmosis.core.pipeline.common.TaskManagerFactoryRegister.getInstance(TaskManagerFactoryRegister.java:60)
at org.openstreetmap.osmosis.core.pipeline.common.Pipeline.buildTasks(Pipeline.java:50)
at org.openstreetmap.osmosis.core.pipeline.common.Pipeline.prepare(Pipeline.java:112)
at org.openstreetmap.osmosis.core.Osmosis.run(Osmosis.java:86)
at org.openstreetmap.osmosis.core.Osmosis.main(Osmosis.java:37)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.codehaus.plexus.classworlds.launcher.Launcher.launchStandard(Launcher.java:329)
at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:239)
at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:409)
at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:352)
at org.codehaus.classworlds.Launcher.main(Launcher.java:47)
-bash: South_America: command not found

Could you please help me with that? Thank you very much.

Best