Thanks for your answer but thats not the problem i got everything in the right place.
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Show posts MenuD:GPSosmosis-0.39bin>osmosis --rb file=venezuela.pbf --mapfile-writer file=nuevo.map
nov 26, 2011 12:45:21 PM org.openstreetmap.osmosis.core.Osmosis run
Informaci¾n: Osmosis Version 0.39
nov 26, 2011 12:45:22 PM org.openstreetmap.osmosis.core.Osmosis run
Informaci¾n: Preparing pipeline.
nov 26, 2011 12:45:22 PM org.openstreetmap.osmosis.core.Osmosis main
Grave: Execution aborted.
org.openstreetmap.osmosis.core.OsmosisRuntimeException: Task type mapfile-writer 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(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
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:31)