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

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This exception has no message.
java.lang.NullPointerException:
at java.io.File.(File.java:180)
at com.experio.common.util.PropertyUtil.getDocument(PropertyUtil.java:196)
at com.experio.common.util.PropertyUtil.getPropertyValues(PropertyUtil.java:262)
at com.experio.common.util.PropertyUtil.initialize(PropertyUtil.java:103)
at com.experio.common.util.PropertyUtil.(PropertyUtil.java:86)
at com.experio.common.util.AppUtil.getInitialContext(AppUtil.java:71)
at com.experio.common.util.AppUtil.createEJB(AppUtil.java:199)
at com.experio.common.util.AppUtil.createEJB(AppUtil.java:156)
at com.experio.common.util.Debug.println(Debug.java:64)
at com.experio.web.control.Entry.service(Entry.java:67)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at com.evermind.server.http.ServletRequestDispatcher.invoke(ServletRequestDispatcher.java:824)
at com.evermind.server.http.ServletRequestDispatcher.forwardInternal(ServletRequestDispatcher.java:330)
at com.evermind.server.http.HttpRequestHandler.processRequest(HttpRequestHandler.java:830)
at com.evermind.server.http.AJPRequestHandler.run(AJPRequestHandler.java:224)
at com.evermind.server.http.AJPRequestHandler.run(AJPRequestHandler.java:133)
at com.evermind.util.ReleasableResourcePooledExecutor$MyWorker.run(ReleasableResourcePooledExecutor.java:186)
at java.lang.Thread.run(Thread.java:534)

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