Upgrade Orbeon 3.9 to 4.5 - orbeon

Question

We are upgrading Orbeon 3.9 to 4.5.
And we are using MySQL 6.1 and JBOSS 5.1.
Followed the procedures described in http://wiki.orbeon.com/forms/doc/developer-guide/form-runner/oracle-and-mysql-persistence-layers?pli=1 for upgrade.
I am getting the Form Runner Home just fine (showing the old applications and forms).
And also If I open any new form(which I created after upgrade) from form runner, its perfect, no problem.
But When I try to click on any old form , I am getting error "An error has occurred in Orbeon Forms"
And In Orbeon.log file, I can see the following :
2014-05-08 14:38:40,151 ERROR PageFlowControllerProcessor - error caught {controller: "oxf:/apps/fr/page-flow.xml", method: "GET", path: "/fr/ApplicationName/formName/edit/5273bf03-9f0a-4ab9-b441-94c1dcdffad2"}
2014-05-08 14:38:40,274 ERROR PageFlowControllerProcessor -
+----------------------------------------------------------------------------------------------------------------------+
|An Error has Occurred |
|----------------------------------------------------------------------------------------------------------------------|
|XPath syntax error at char 0 in {}: |
| Unexpected token <"eof"> in path expression
|
|----------------------------------------------------------------------------------------------------------------------|
|Application Call Stack |
|----------------------------------------------------------------------------------------------------------------------|
|oxf:/apps/fr/page-flow.xml |executing processor | 208|
|······················································································································|
|name={http://www.orbeon.com/oxf/processors}pipeline |
|----------------------------------------------------------------------------------------------------------------------|
|oxf:/config/epilogue.xpl |executing processor | 60|
|······················································································································|
|element=[...] |
|name ={}pipeline |
|----------------------------------------------------------------------------------------------------------------------|
|oxf:/config/epilogue-servlet.xpl |reading processor output | 31|
|······················································································································|
|element= |
|name =xformed-data |
|----------------------------------------------------------------------------------------------------------------------|
|oxf:/config/epilogue.xpl |reading processor output | 41|
|······················································································································|
|element= |
|name =xformed-data |
|id =xformed-data |
|----------------------------------------------------------------------------------------------------------------------|
|oxf:/ops/pfc/xforms-epilogue.xpl |reading processor output | 95|
|······················································································································|
|element= |
|name =data |
|ref =xformed-data |
|----------------------------------------------------------------------------------------------------------------------|
|oxf:/ops/pfc/xforms-epilogue.xpl |reading processor output | 88|
|······················································································································|
|element= |
|name =data |
|id =xincluded-data |
|----------------------------------------------------------------------------------------------------------------------|
|oxf:/ops/pfc/xforms-epilogue.xpl |reading processor output | 77|
|······················································································································|
|element= |
|name =document |
|id =xhtml-data |