Invalid UTF8 Data while starting the TN server

HI,
Can any one help me to this error.Iam using oracle9.0 and charcterset is Unicode UTF8 with DataDirect Oracle driver.Iam getting this error when i activate partners and restart the server.So while starting ,the server cannot able to build BizDocStore.

Thanks in Advance.

Balaji

<errorcode>TRNSERV.000019.000041</errorcode>
<info>Error filling BizDocTypeStore cache</info>
<originalexception>
<javaclass>com.wm.app.tn.db.DatastoreException</javaclass>
<message>Database error fetching all types: [wm-cjdbc33-0009][Oracle JDBC Driver]Transliteration failed, reason: invalid UTF8 data
(0) java.sql.SQLException: [wm-cjdbc33-0009][Oracle JDBC Driver]Transliteration failed, reason: invalid UTF8 data
(1) java.sql.SQLException: [wm-cjdbc33-0009][Oracle JDBC Driver]Transliteration failed, reason: invalid UTF8 data
</message>
<stacktrace>java.sql.SQLException: [wm-cjdbc33-0009][Oracle JDBC Driver]Transliteration failed, reason: invalid UTF8 data
java.sql.SQLException: [wm-cjdbc33-0009][Oracle JDBC Driver]Transliteration failed, reason: invalid UTF8 data
java.sql.SQLException: [wm-cjdbc33-0009][Oracle JDBC Driver]Transliteration failed, reason: invalid UTF8 data
at com.wm.dd.jdbc.base.BaseExceptions.createException(Unknown Source)
at com.wm.dd.jdbc.base.BaseExceptions.getException(Unknown Source)
at com.wm.dd.jdbc.oracle.OracleImplResultset.getData(Unknown Source)
at com.wm.dd.jdbc.base.BaseResultSet.getString(Unknown Source)
at com.wm.app.tn.db.BDTypeOperations.getAllTypes(BDTypeOperations.java:57)
at com.wm.app.tn.db.BDTypeOperations.getAll(BDTypeOperations.java:30)
at com.wm.app.tn.db.BizDocTypeStore.fillCache(BizDocTypeStore.java:50)
at wm.tn.doctype.init(doctype.java:54)
at wm.tn.admin.startup(admin.java:730)
at java.lang.reflect.Method.invoke(Native Method)
at com.wm.app.b2b.server.JavaService.baseInvoke(JavaService.java:287)
at com.wm.app.b2b.server.invoke.InvokeManager.process(InvokeManager.java:554)
at com.wm.app.b2b.server.invoke.StatisticsProcessor.process(StatisticsProcessor.java:44)
at com.wm.app.b2b.server.invoke.ServiceCompletionImpl.process(ServiceCompletionImpl.java:221)
at com.wm.app.b2b.server.invoke.ValidateProcessor.process(ValidateProcessor.java:49)
at com.wm.app.b2b.server.ACLManager.process(ACLManager.java:194)
at com.wm.app.b2b.server.invoke.DispatchProcessor.process(DispatchProcessor.java:39)
at com.wm.app.b2b.server.AuditLogManager.process(AuditLogManager.java:384)
at com.wm.app.b2b.server.invoke.InvokeManager.invoke(InvokeManager.java:486)
at com.wm.app.b2b.server.invoke.InvokeManager.invoke(InvokeManager.java:359)
at com.wm.app.b2b.server.ServiceManager.invoke(ServiceManager.java:246)
at com.wm.app.b2b.server.ServiceManager.invoke(ServiceManager.java:128)
at com.wm.app.b2b.server.ServiceManager.invoke(ServiceManager.java:100)
at com.wm.app.b2b.server.SessionInvoke.run(Session.java:705)
at com.wm.util.pool.PooledThread.run(PooledThread.java:105)
at java.lang.Thread.run(Thread.java:512)
</stacktrace>
</originalexception>
<action></action>
<level>0</level>
</exmlexception> [TRNSERV.000021.000005