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

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java.lang.NoClassDefFoundError:
at org.apache.struts.tiles.DefinitionsFactoryConfig.populate(DefinitionsFactoryConfig.java:355)
at org.apache.struts.tiles.DefinitionsUtil.populateDefinitionsFactoryConfig(DefinitionsUtil.java:391)
at org.apache.struts.tiles.DefinitionsUtil.readFactoryConfig(DefinitionsUtil.java:410)
at org.apache.struts.tiles.DefinitionsUtil.createDefinitionsFactory(DefinitionsUtil.java:213)
at org.apache.struts.tiles.DefinitionsUtil.createDefinitionsFactory(DefinitionsUtil.java:248)
at org.apache.struts.tiles.ActionComponentServlet.initComponentDefinitionsMapping(ActionComponentServlet.java:136)
at org.apache.struts.tiles.ActionComponentServlet.init(ActionComponentServlet.java:109)
at javax.servlet.GenericServlet.init(GenericServlet.java:44)

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