Hi Amit,
          I refeered the same post and have used the same method to pass parameters but still I am not able to pass the parameters.

client controller

var expname = nameField.get("v.value"); // fetching the parameter from component
          
   var action = component.get("c.serverEcho");

    action.setParams({  recordId : expname  });// setting the parameter to apex class method

server controller

public static String serverEcho(String recordId) {

	        return ('Hello from the server, ' + recordId);
}

Please refer my code and let me know if bug exists.
Thanks
Aruna

Aruna,

Have you made you Server Controller method @AuraEnabled and controller in your component.

Also, could you please share complete code for controller, component and Server Controller. 

Use below code.

Component

<aura:component controller="SimpleServerSideController">
    <aura:attribute name="firstName" type="String" default="world"/>
    <ui:button label="Call server" press="{!c.echo}"/>
</aura:component>

Client Side controller.js

({
    "echo" : function(cmp) {
        // create a one-time use instance of the serverEcho action
        // in the server-side controller
        var action = cmp.get("c.serverEcho");
        action.setParams({ firstName : cmp.get("v.firstName") });

        // Create a callback that is executed after 
        // the server-side action returns
        action.setCallback(this, function(response) {
            var state = response.getState();
            // This callback doesn’t reference cmp. If it did,
            // you should run an isValid() check
            //if (cmp.isValid() && state === "SUCCESS") {
            if (state === "SUCCESS") {
                // Alert the user with the value returned 
                // from the server
                alert("From server: " + response.getReturnValue());

                // You would typically fire a event here to trigger 
                // client-side notification that the server-side 
                // action is complete
            }
            //else if (cmp.isValid() && state === "INCOMPLETE") {
            else if (state === "INCOMPLETE") {
                // do something
            }
            //else if (cmp.isValid() && state === "ERROR") {
            else if (state === "ERROR") {
                var errors = response.getError();
                if (errors) {
                    if (errors[0] && errors[0].message) {
                        console.log("Error message: " + 
                                 errors[0].message);
                    }
                } else {
                    console.log("Unknown error");
                }
            }
        });

        $A.enqueueAction(action);
    }
})

Server Controller Method :

public static String serverEcho(String firstName) {

	        return ('Hello from the server, ' + firstName);
}

Also, It is very difficult to debug the problem so you have to be careful while developing lighting components.

Hope this will helps :)

Thanks!