osmosis permanent breakdown: “pipes have not been terminated with appropriate output sinks”

I terminated osmosis several times during the run by Ctrl+c, and now it cannot do enen simplest tasks, giving an error: "The following named pipes () and 1 default pipes have not been terminated with appropriate output sinks."

$ osmosis --rx file="my.xml"
14.05.2016 14:24:29 org.openstreetmap.osmosis.core.Osmosis run
INFO: Osmosis Version 0.44.1
14.05.2016 14:24:29 org.openstreetmap.osmosis.core.Osmosis run
INFO: Preparing pipeline.
14.05.2016 14:24:29 org.openstreetmap.osmosis.core.Osmosis main
SEVERE: Execution aborted.
org.openstreetmap.osmosis.core.OsmosisRuntimeException: The following named pipes () and 1 default pipes have not been terminated with appropriate output sinks.
at org.openstreetmap.osmosis.core.pipeline.common.Pipeline.connectTasks(Pipeline.java:94)
at org.openstreetmap.osmosis.core.pipeline.common.Pipeline.prepare(Pipeline.java:116)
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:330)
at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:238)
at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:415)
at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:356)
at org.codehaus.classworlds.Launcher.main(Launcher.java:47)

I'm on OSX 10.8, rebooting or even

 brew uninstall osmosis
 brew install osmosis

don't help. How can I fix it?