forge alpha4

error when upgrade to forge alpha4

Exception in thread "Thread-0" java.lang.NoClassDefFoundError: org/jboss/seam/forge/shell/plugins/Plugin
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClassCond(ClassLoader.java:631)
at java.lang.ClassLoader.defineClass(ClassLoader.java:615)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:283)
at java.net.URLClassLoader.access$000(URLClassLoader.java:58)
at java.net.URLClassLoader$1.run(URLClassLoader.java:197)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
at java.lang.Class.getEnclosingMethod0(Native Method)
at java.lang.Class.getEnclosingMethodInfo(Class.java:929)
at java.lang.Class.getEnclosingClass(Class.java:1081)
at java.lang.Class.getSimpleBinaryName(Class.java:1220)
at java.lang.Class.getSimpleName(Class.java:1112)
at java.lang.Class.isAnonymousClass(Class.java:1188)
at org.jboss.weld.introspector.jlr.WeldClassImpl.isAnonymousClass(WeldClassImpl.java:445)
at org.jboss.weld.bootstrap.AbstractBeanDeployer.isTypeManagedBeanOrDecoratorOrInterceptor(AbstractBeanDeployer.java:295)
at org.jboss.weld.bootstrap.BeanDeployer.createBeans(BeanDeployer.java:143)
at org.jboss.weld.bootstrap.BeanDeployment.deployBeans(BeanDeployment.java:216)
at org.jboss.weld.bootstrap.WeldBootstrap.deployBeans(WeldBootstrap.java:364)
at org.jboss.weld.environment.se.Weld.initialize(Weld.java:87)
at org.jboss.forge.shell.Bootstrap$2.run(Bootstrap.java:90)
at java.lang.Thread.run(Thread.java:662)
Caused by: java.lang.ClassNotFoundException: org.jboss.seam.forge.shell.plugins.Plugin
at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
... 25 more

after
remove .forge/plugins/com.ocpsoft.forge$prettyfaces-plugin$1$1.0.0.Alpha1.jar

ok