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

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This exception has no message.
java.lang.NullPointerException:
at tcom.sun.identity.saml.common.SAMLServiceManager.getAttribute(SAMLServiceManager.java:822)
at tcom.sun.identity.saml.AssertionManager.createAssertion(AssertionManager.java:519)
at tcom.sun.identity.saml.AssertionManager.createAssertion(AssertionManager.java:203)
at tcom.sun.identity.saml.AssertionManager.createAssertion(AssertionManager.java:188)
at undefined.tAssertionArtifactNSF.doGet(AssertionArtifactNSF.java:120)
at tjavax.servlet.http.HttpServlet.service(HttpServlet.java:740)
at tjavax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at tcom.iplanet.server.http.servlet.NSServletRunner.invokeServletService(NSServletRunner.java:919)
at tcom.iplanet.server.http.servlet.NSServletRunner.Service(NSServletRunner.java:483)

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