java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at java.io.FileInputStream.(Unknown Source)
at org.eclipse.wst.server.core.util.PublishHelper.copyFile(PublishHelper.java:501)
at org.eclipse.wst.server.core.util.PublishHelper.publishDelta(PublishHelper.java:435)
at org.eclipse.wst.server.core.util.PublishHelper.publishDelta(PublishHelper.java:459)
at org.eclipse.jst.server.tomcat.core.internal.PublishOperation2.publishDir(PublishOperation2.java:141)
at org.eclipse.jst.server.tomcat.core.internal.PublishOperation2.execute(PublishOperation2.java:82)
at org.eclipse.wst.server.core.model.ServerBehaviourDelegate.performTasks(ServerBehaviourDelegate.java:1290)
at org.eclipse.wst.server.core.model.ServerBehaviourDelegate.publish(ServerBehaviourDelegate.java:933)
at org.eclipse.wst.server.core.model.ServerBehaviourDelegate.publish(ServerBehaviourDelegate.java:774)
at org.eclipse.wst.server.core.internal.Server.publishImpl(Server.java:3087)

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