JBO-25002: Definition oracle.apps.ak.region.server.AkAmParameterRegistryVO of type View Definition not found

Akhilesh pinged me today with this issue in one of the instances:

After keying in username and password this error would appear:

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You have encountered an unexpected error. Please contact the System Administrator for assistance.  

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Exception details: 
oracle.apps.fnd.framework.OAException: oracle.jbo.NoDefException: JBO-25002: Definition oracle.apps.ak.region.server.AkAmParameterRegistryVO of type View Definition not found
at oracle.apps.fnd.framework.webui.OAPageErrorHandler.prepareException(OAPageErrorHandler.java:1223)
at oracle.apps.fnd.framework.webui.OAPageBean.preparePage(OAPageBean.java:1986)
at oracle.apps.fnd.framework.webui.OAPageBean.preparePage(OAPageBean.java:508)
at oracle.apps.fnd.framework.webui.OAPageBean.preparePage(OAPageBean.java:429)
at _oa__html._OA._jspService(_OA.java:85)
at oracle.jsp.runtime.HttpJsp.service(HttpJsp.java:119)
at oracle.jsp.app.JspApplication.dispatchRequest(JspApplication.java:417)
at oracle.jsp.JspServlet.doDispatch(JspServlet.java:267)
at oracle.jsp.JspServlet.internalService(JspServlet.java:186)
at oracle.jsp.JspServlet.service(JspServlet.java:156)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:588)
at oracle.jsp.provider.Jsp20RequestDispatcher.forward(Jsp20RequestDispatcher.java:162)
at oracle.jsp.runtime.OraclePageContext.forward(OraclePageContext.java:187)
at _oa__html._OA._jspService(_OA.java:95)
at oracle.jsp.runtime.HttpJsp.service(HttpJsp.java:119)
at oracle.jsp.app.JspApplication.dispatchRequest(JspApplication.java:417)
at oracle.jsp.JspServlet.doDispatch(JspServlet.java:267)
at oracle.jsp.JspServlet.internalService(JspServlet.java:186)
at oracle.jsp.JspServlet.service(JspServlet.java:156)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:588)
at oracle.jsp.provider.Jsp20RequestDispatcher.forward(Jsp20RequestDispatcher.java:162)
at oracle.jsp.runtime.OraclePageContext.forward(OraclePageContext.java:187)
at _oa__html._OA._jspService(_OA.java:95)
at oracle.jsp.runtime.HttpJsp.service(HttpJsp.java:119)
at oracle.jsp.app.JspApplication.dispatchRequest(JspApplication.java:417)
at oracle.jsp.JspServlet.doDispatch(JspServlet.java:267)
at oracle.jsp.JspServlet.internalService(JspServlet.java:186)
at oracle.jsp.JspServlet.service(JspServlet.java:156)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:588)
at org.apache.jserv.JServConnection.processRequest(JServConnection.java:456)
at org.apache.jserv.JServConnection.run(JServConnection.java:294)
at java.lang.Thread.run(Thread.java:595)
## Detail 0 ##
oracle.apps.fnd.framework.OAException: oracle.jbo.NoDefException: JBO-25002: Definition oracle.apps.ak.region.server.AkAmParameterRegistryVO of type View Definition not found
at oracle.apps.fnd.framework.OAException.wrapperException(OAException.java:891)
at oracle.apps.fnd.framework.webui.OAPageErrorHandler.prepareException(OAPageErrorHandler.java:1145)
at oracle.apps.fnd.framework.webui.OAPageBean.preparePage(OAPageBean.java:1986)
at oracle.apps.fnd.framework.webui.OAPageBean.preparePage(OAPageBean.java:508)
at oracle.apps.fnd.framework.webui.OAPageBean.preparePage(OAPageBean.java:429)
at _oa__html._OA._jspService(_OA.java:85)
at oracle.jsp.runtime.HttpJsp.service(HttpJsp.java:119)
at oracle.jsp.app.JspApplication.dispatchRequest(JspApplication.java:417)
at oracle.jsp.JspServlet.doDispatch(JspServlet.java:267)
at oracle.jsp.JspServlet.internalService(JspServlet.java:186)
at oracle.jsp.JspServlet.service(JspServlet.java:156)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:588)
at oracle.jsp.provider.Jsp20RequestDispatcher.forward(Jsp20RequestDispatcher.java:162)
at oracle.jsp.runtime.OraclePageContext.forward(OraclePageContext.java:187)
at _oa__html._OA._jspService(_OA.java:95)
at oracle.jsp.runtime.HttpJsp.service(HttpJsp.java:119)
at oracle.jsp.app.JspApplication.dispatchRequest(JspApplication.java:417)
at oracle.jsp.JspServlet.doDispatch(JspServlet.java:267)
at oracle.jsp.JspServlet.internalService(JspServlet.java:186)
at oracle.jsp.JspServlet.service(JspServlet.java:156)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:588)
at oracle.jsp.provider.Jsp20RequestDispatcher.forward(Jsp20RequestDispatcher.java:162)
at oracle.jsp.runtime.OraclePageContext.forward(OraclePageContext.java:187)
at _oa__html._OA._jspService(_OA.java:95)
at oracle.jsp.runtime.HttpJsp.service(HttpJsp.java:119)
at oracle.jsp.app.JspApplication.dispatchRequest(JspApplication.java:417)
at oracle.jsp.JspServlet.doDispatch(JspServlet.java:267)
at oracle.jsp.JspServlet.internalService(JspServlet.java:186)
at oracle.jsp.JspServlet.service(JspServlet.java:156)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:588)
at org.apache.jserv.JServConnection.processRequest(JServConnection.java:456)
at org.apache.jserv.JServConnection.run(JServConnection.java:294)
at java.lang.Thread.run(Thread.java:595)
oracle.apps.fnd.framework.OAException: oracle.jbo.NoDefException: JBO-25002: Definition oracle.apps.ak.region.server.AkAmParameterRegistryVO of type View Definition not found
at oracle.apps.fnd.framework.OAException.wrapperException(OAException.java:891)
at oracle.apps.fnd.framework.webui.OAPageErrorHandler.prepareException(OAPageErrorHandler.java:1145)
at oracle.apps.fnd.framework.webui.OAPageBean.preparePage(OAPageBean.java:1986)
at oracle.apps.fnd.framework.webui.OAPageBean.preparePage(OAPageBean.java:508)
at oracle.apps.fnd.framework.webui.OAPageBean.preparePage(OAPageBean.java:429)
at _oa__html._OA._jspService(_OA.java:85)
at oracle.jsp.runtime.HttpJsp.service(HttpJsp.java:119)
at oracle.jsp.app.JspApplication.dispatchRequest(JspApplication.java:417)
at oracle.jsp.JspServlet.doDispatch(JspServlet.java:267)
at oracle.jsp.JspServlet.internalService(JspServlet.java:186)
at oracle.jsp.JspServlet.service(JspServlet.java:156)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:588)
at oracle.jsp.provider.Jsp20RequestDispatcher.forward(Jsp20RequestDispatcher.java:162)
at oracle.jsp.runtime.OraclePageContext.forward(OraclePageContext.java:187)
at _oa__html._OA._jspService(_OA.java:95)
at oracle.jsp.runtime.HttpJsp.service(HttpJsp.java:119)
at oracle.jsp.app.JspApplication.dispatchRequest(JspApplication.java:417)
at oracle.jsp.JspServlet.doDispatch(JspServlet.java:267)
at oracle.jsp.JspServlet.internalService(JspServlet.java:186)
at oracle.jsp.JspServlet.service(JspServlet.java:156)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:588)
at oracle.jsp.provider.Jsp20RequestDispatcher.forward(Jsp20RequestDispatcher.java:162)
at oracle.jsp.runtime.OraclePageContext.forward(OraclePageContext.java:187)
at _oa__html._OA._jspService(_OA.java:95)
at oracle.jsp.runtime.HttpJsp.service(HttpJsp.java:119)
at oracle.jsp.app.JspApplication.dispatchRequest(JspApplication.java:417)
at oracle.jsp.JspServlet.doDispatch(JspServlet.java:267)
at oracle.jsp.JspServlet.internalService(JspServlet.java:186)
at oracle.jsp.JspServlet.service(JspServlet.java:156)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:588)
at org.apache.jserv.JServConnection.processRequest(JServConnection.java:456)
at org.apache.jserv.JServConnection.run(JServConnection.java:294)
at java.lang.Thread.run(Thread.java:595)

It was unable to find oracle.apps.ak.region.server.AkAmParameterRegistryVO of type View Definition, so I logged on to the web node and did this:

cd $OA_JAVA/oracle/apps/ak/region/server
$ ls -ltr AkAmParameterRegistryVO*
No files.
$ ls -ltr | wc -l
0
No files !!!!!

du -sk $OA_JAVA
1243892

I checked in concurrent node and did the same thing:

cd $OA_JAVA/oracle/apps/ak/region/server
$ ls -ltr AkAmParameterRegistryVO*
-rw-r--r-- 1 applmgr dba 1417 Sep 21 2001 AkAmParameterRegistryVO.xml
$ ls -ltr | wc -l
98

$ du -sk $OA_JAVA
1597226 $OA_JAVA

That's a difference of nearly 400 MB. Clearly all the files in $OA_JAVA were not copied during clone. Once the files were copied, the error went away.