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You are aware of forum.appian.com/.../Custom_Smart_Service_Plug-ins.html It says "Do not call ServiceLocator.get*."

@stefanh791 so if i dnt call ServiceLocator how can i create reference to ContentService?/

The referenced documentation describes it. An example:

public MySmartService(SmartServiceContext smartServiceCtx, Context initialContext) {
super();
this.smartServiceCtx = smartServiceCtx;
this.initialContext = initialContext;
}

You can just download one of the newer plugins and check out the included source code.

download plugin from where?

Here in forum. Records -> Shared Components

Can you check with this definition

ServiceContext sc= WebServiceContextFactory.getServiceContext("Administrator");
ContentService cs = ServiceLocator.getContentService(sc);

In addition to the suggestions given by Stefan, I would like to add these:
1. Never instantiate any *Service using a ServiceLocator. In smart services and custom expression function plugins, the Services are injected automatically. In case of Smart Services, you can access the injected smart service by adding parameters in the Constructor. Then you can use them in your run() method. This will avoid the need for ServiceLocator().
The solution given by @samiullahm is also not an ideal one.
Check this link for details: forum.appian.com/.../Custom_Smart_Service_Plug-ins.html
2. Avoid using the Administrator context(not considered a good practice). If you decide to submit your plugin to the Forum for Cloud Approval, it won't be approved. You can get the context of the user by username. If you still want to use the admin context in the custom plugins, I suggest the following approach: Create a new third party credentials in the Admin console. Add a key called "username" in it. Then in the plugin code, get the context of the user like this:
String username = null;
                    try {
                              Map<String, String> securedValues = scs.getSystemSecuredValues(EXTERNAL_KEY) ;
                              username = securedValues.get(USERNAME_FIELD);
                              LOG.debug("The username is "+username);
                    } catch (InsufficientPrivilegesException | ObjectNotFoundException e) {
                              LOG.error("Could not get the Secure credentials key");
                              e.printStackTrace();
                    }
                    ServiceContext sc_userContext = ServiceContextFactory.getServiceContext(username);