Need help - Portlet ActionLookupFailedException

Hi,
I am having the below error.I have a simple pageflow controller and using a JPF portlet for rendering.
com.bea.portlet.adapter.scopedcontent.ActionLookupFailedException
at com.bea.portlet.adapter.scopedcontent.PageFlowStubImpl.handleNullActionResult(PageFlowStubImpl.java:236)
at com.bea.portlet.adapter.scopedcontent.ScopedContentCommonSupport.executeAction(ScopedContentCommonSupport.java:744)
at com.bea.portlet.adapter.scopedcontent.ScopedContentCommonSupport.renderInternal(ScopedContentCommonSupport.java:268)
at com.bea.portlet.adapter.scopedcontent.PageFlowStubImpl.render(PageFlowStubImpl.java:136)
at com.bea.netuix.servlets.controls.content.NetuiContent.preRender(NetuiContent.java:288)

Hi,
Even I got this error long back. I could not find solution for this.
my guess is, It can be because of session time-out. I tried access the same application in new window.. i did not come across this error again.
Try to catch and handle session-timeout exception.
Let me know if it helped you.
Thanks,
Suman

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---------------------------------------+
|       |                                |
a|   I   |              II                |
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---------------------------------------+
|       |                                |
|       |                                |
|       |                                |
|       |                                |
|       |                                |
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|       |                                |
|       |                                |
|       |                                |
|       |                                |
|       |                                |
|       |                                |
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|               .             VI         |
|     .                 .                |a
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|                                        |
|   .                                    |
b|                                     . |
|                                        |
|                  IX                    |
| .                                      |
|                                    .   |b
|                                        |
+                                        |
|      .                                 |
a|               .                  . VII |
| VIII                   .              |
---------------------------------------+
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Message was edited by: DarkxFlamexCaster
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2 (select b.column_name
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SQL> /
Table created.
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function ret_columns return column_type is
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