ejbdeploy throws exception

[ganeshkumar marimuthu]

can anybody help me in this ant problem,while executing ejbdeploy task.

file:F:/ganeshkumar/testant/build/build.xml:22: Exception while calling ejbdeplo
y. Details: java.lang.NullPointerException
at org.apache.tools.ant.taskdefs.optional.ejb.WebsphereDeploymentTool.bu
ildWebsphereJar(WebsphereDeploymentTool.java:669)
at org.apache.tools.ant.taskdefs.optional.ejb.WebsphereDeploymentTool.wr
iteJar(WebsphereDeploymentTool.java:689)
at org.apache.tools.ant.taskdefs.optional.ejb.GenericDeploymentTool.proc
essDescriptor(GenericDeploymentTool.java:478)
at org.apache.tools.ant.taskdefs.optional.ejb.EjbJar.execute(EjbJar.java
:592)
at org.apache.tools.ant.Task.perform(Task.java:317)
at org.apache.tools.ant.Target.execute(Target.java:309)
at org.apache.tools.ant.Target.performTasks(Target.java:334)
at org.apache.tools.ant.Project.executeTarget(Project.java:1306)
at org.apache.tools.ant.Project.executeTargets(Project.java:1250)
at org.apache.tools.ant.Main.runBuild(Main.java:610)
at org.apache.tools.ant.Main.start(Main.java:196)
at org.apache.tools.ant.Main.main(Main.java:235)
--- Nested Exception ---
java.lang.NullPointerException
at java.io.File.<init>(File.java:194)
at org.apache.tools.ant.taskdefs.optional.ejb.WebsphereDeploymentTool.bu
ildWebsphereJar(WebsphereDeploymentTool.java:637)
at org.apache.tools.ant.taskdefs.optional.ejb.WebsphereDeploymentTool.wr
iteJar(WebsphereDeploymentTool.java:689)
at org.apache.tools.ant.taskdefs.optional.ejb.GenericDeploymentTool.proc
essDescriptor(GenericDeploymentTool.java:478)
at org.apache.tools.ant.taskdefs.optional.ejb.EjbJar.execute(EjbJar.java
:592)
at org.apache.tools.ant.Task.perform(Task.java:317)
at org.apache.tools.ant.Target.execute(Target.java:309)
at org.apache.tools.ant.Target.performTasks(Target.java:334)
at org.apache.tools.ant.Project.executeTarget(Project.java:1306)
at org.apache.tools.ant.Project.executeTargets(Project.java:1250)
at org.apache.tools.ant.Main.runBuild(Main.java:610)
at org.apache.tools.ant.Main.start(Main.java:196)
at org.apache.tools.ant.Main.main(Main.java:235)

thank u in advance!!!
ganesh kumar