Error during invocation of a created process

Hi All,

I am getting the following error when i am calling a process which i have created,

Exception in thread "Main Thread" com.adobe.idp.DocumentError: error unmarshalling arguments; nested exception is:
java.lang.ClassNotFoundException: Failed to load class com.adobe.idp.DocumentFileID (see the server-side log for details)
at com.adobe.idp.DocumentManagerClient.clientSidePush(DocumentManagerCli ent.java:181)
at com.adobe.idp.Document.passivateInitData(Document.java:865)
at com.adobe.idp.Document.passivate(Document.java:704)
at com.adobe.idp.Document.passivate(Document.java:661)
at com.adobe.idp.Document.writeObject(Document.java:500)

Any help is appreciated.

Thanks
Raghu