After applying SP21 the web dynpro is not working (WDTypeNotFoundException)

Hi
We have recently applied SP21 to our NW04 system.
The patch was successfully applied. But while accessing the Web Dynpro, we are getting WDTypeNotFoundException exception.
The Error Message is as follows :
+500 Internal Server Error
Web Dynpro Container/SAP J2EE Engine/6.40
Failed to process request. Please contact your system administrator.
Hide
Error Summary
While processing the current request, an exception occured which could not be handled by the application or the framework.
If the information contained on this page doesn't help you to find and correct the cause of the problem, please contact your system administrator. To facilitate analysis of the problem, keep a copy of this error page. Hint: Most browsers allow to select all content, copy it and then paste it into an empty document (e.g. email or simple text file).
Root Cause
The initial exception that caused the request to fail, was:
500 Internal Server Error
Web Dynpro Container/SAP J2EE Engine/6.40
Failed to process request. Please contact your system administrator.
Hide
Error Summary
While processing the current request, an exception occured which could not be handled by the application or the framework.
If the information contained on this page doesn't help you to find and correct the cause of the problem, please contact your system administrator. To facilitate analysis of the problem, keep a copy of this error page. Hint: Most browsers allow to select all content, copy it and then paste it into an empty document (e.g. email or simple text file).
Root Cause
The initial exception that caused the request to fail, was:
com.sap.tc.webdynpro.services.exceptions.WDTypeNotFoundException: type jp.co.companyname.projectname.pp.fnp09.datapreparemodel.types.Ru_cnfind not found
at com.sap.tc.webdynpro.services.datatypes.core.DataTypeBroker.getDataType(DataTypeBroker.java:224)
at com.sap.tc.webdynpro.progmodel.context.DataAttributeInfo.init(DataAttributeInfo.java:318)
at com.sap.tc.webdynpro.progmodel.context.NodeInfo.addAttribute(NodeInfo.java:517)
at com.sap.tc.webdynpro.progmodel.context.NodeInfo.addAttribute(NodeInfo.java:530)
at jp.co.companyname.projectname.pp.fnp09.main.RawMaterialView.wdDoModifyView(RawMaterialView.java:191)
... 28 more
See full exception chain for details.
System Environment
Client
Web Dynpro Client Type HTML Client
User agent Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2; .NET CLR 1.1.4322)
Version
DOM version
Client Type msie6
Client Type Profile ie6
ActiveX enabled
Cookies enabled
Frames enabled
Java Applets enabled
JavaScript enabled
Tables enabled
VB Script enabled
Server
Web Dynpro Runtime Vendor: SAP, Build ID: 6.4021.00.0000.20070905102710.0000 (release=630_VAL_REL, buildtime=2007-09-19:20:40:15UTC, changelist=460812, host=PWDFM026)
J2EE Engine 6.40 patchlevel 109749.313
Java VM Java HotSpot(TM) Server VM, version:1.4.2_13-b06, vendor: Sun Microsystems Inc.
Operating system Windows 2003, version: 5.2, architecture: x86
Other
Session Locale ja
Time of Failure Mon May 17 18:35:52 JST 2007 (Java Time: 1197884152810)
Web Dynpro Code Generation Infos
companyname.co.jp/pp~fnp09
SapDictionaryGenerationCore 6.4010.00.0000.20040910101802.0000 (release=630_VAL_REL, buildtime=2004-12-09:22:23:41UTC, changelist=280522, host=PWDFM026.wdf.sap.corp) +
If you have any ideas please let me know.
thanks and Regards
Raghunahth L

Hi raghu,
You can go to Visual administrator (/usr/sap/<SID>/JCxx/j2ee/admin--go.bat)
Give administrator credentials..
Cluster-Server-Services-webdynpro Runtime.
See if it is stopped.You can see red croos,if it is stopped.If it is,
Right click on Webdynpro Runtine and start.
One more option,you can give a try is start all teh srvices manually through
telnet
This can be done with "run' command on you system
telnet <IP adress> telnet port
telnet port will be http port ending with 8.
then give administrtaor credentials.
then go with these commands,
jump 0
add deploy
list_app
start_app-all
Try looki in for detailed error messages in default trace and application logs.
Loc : /usr/sap/<SID>/JCxx/j2ee/cluster/server0/log
Regards
Usha

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