proj4j plugin cannot be loaded on startup

[Cobra]

Log:

loading plugin 'proj4j' (version 27902)
org.openstreetmap.josm.plugins.PluginException: An error occurred in plugin proj4j
        at org.openstreetmap.josm.plugins.PluginInformation.load(PluginInformation.java:284)
        at org.openstreetmap.josm.plugins.PluginHandler.loadPlugin(PluginHandler.java:499)
        at org.openstreetmap.josm.plugins.PluginHandler.loadPlugins(PluginHandler.java:557)
        at org.openstreetmap.josm.plugins.PluginHandler.loadEarlyPlugins(PluginHandler.java:579)
        at org.openstreetmap.josm.gui.MainApplication.main(MainApplication.java:263)
Caused by: java.lang.reflect.InvocationTargetException
        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
        at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
        at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
        at java.lang.reflect.Constructor.newInstance(Constructor.java:525)
        at org.openstreetmap.josm.plugins.PluginInformation.load(PluginInformation.java:275)
        ... 4 more
Caused by: java.lang.NoClassDefFoundError: org/openstreetmap/josm/data/projection/ProjectionSubPrefs
        at java.lang.ClassLoader.defineClass1(Native Method)
        at java.lang.ClassLoader.defineClass(ClassLoader.java:791)
        at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
        at java.net.URLClassLoader.defineClass(URLClassLoader.java:449)
        at java.net.URLClassLoader.access$100(URLClassLoader.java:71)
        at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
        at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:423)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:356)
        at org.openstreetmap.josm.plugins.proj4j.Proj4J.<init>(Proj4J.java:12)
        ... 9 more
Caused by: java.lang.ClassNotFoundException: org.openstreetmap.josm.data.projection.ProjectionSubPrefs
        at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
        at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:423)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:356)
        ... 21 more

Version info:

Repository Root: http://josm.openstreetmap.de/svn
Build-Date: 2012-05-15 01:31:01
Last Changed Author: simon04
Revision: 5240
Repository UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
URL: http://josm.openstreetmap.de/svn/trunk
Last Changed Date: 2012-05-14 15:04:43 +0200 (Mon, 14 May 2012)
Last Changed Rev: 5240

Identification: JOSM/1.5 (5240 en)
Memory Usage: 210 MB / 1820 MB (125 MB allocated, but free)
Java version: 1.7.0_04, Oracle Corporation, Java HotSpot(TM) 64-Bit Server VM
Operating system: Linux

[bastiK]

In [o28394].