cannot start the j2ee engine

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hello.

we are facing a problem with the J2EE engine of WAS.

we stopped the server for some reasons and when trying to restart it, the server shows an error after loading the service manager ,in the server and the server is not getting connected.i am pasting the errors below:

"Loading: ServiceManager ...

ID000539: Classload error; Can't load service telnet because referenced service shell not found"

and

"ID000544: Error starting service security. JCO.classInitialize(): Could not load

middleware layer 'com.sap.mw.jco.rfc.MiddlewareRFC'

default_cpc_mode"

Also in the management console of the j2ee engine we are unable to find the database instance in the tree. we checked the view and nothing is hidden.

We will be thankful if anyone can throw some light. Thankyou