lightning:carousel error

I’m new to lightning and never used carousel component. My requirement is to display different images by querying from object level and upon clicking on the picture it will call another component and pass a value which will be used as an attribute of the 2nd component.Kindly help.. please find below component ..

apex

public class imagecheckcontact{

@AuraEnabled 
public static List<contact> getcons(){
    return [Select Id,name,sankha__image__c from contact where id in ('00328000014LZcM', '00328000014LZjA')];
}

}

component

<lightning:carousel >
    <aura:iteration items="{!v.conct}" var="con">
        <lightning:carouselImage width="500px" height="600px" src = "{!con.sankha__image__c}" 
                                 description = "First card description."  onclick="{c.navigate}"  header = "{!con.name}" 
                                 >
        </lightning:carouselImage>
    </aura:iteration>
</lightning:carousel>

JS

---

({
    doInit : function(component, event, helper) {
        var action = component.get("c.getcons"); 
        action.setCallback(this, function(response){
            var state = response.getState();
            if (component.isValid() && state === "SUCCESS") {
                var retrunRes = response.getReturnValue();
                component.set("v.conct" ,retrunRes );
            }
        });
        $A.enqueueAction(action);
    },
    navigate:function(component, event, helper) {
            var evt = $A.get("e.force:navigateToComponent");
        evt.setParams({
            componentDef : "c:Helloworld",
            componentAttributes: {
                contactName : component.get("v.contact.Name")
            }
        });
        evt.fire();
    }

})

Seminar_Catalog__c camp = [SELECT Id, Image__c FROM Seminar_Catalog__c where id ='a079E00000ALyU1' LIMIT 1];
System.debug('Rich field:');
System.debug(camp.Image__c);
String firstSubString = camp.Image__c.substringBetween('<img', 'img>');
System.debug('First substring: ' + firstSubString);
String secondSubString = firstSubString.substringBetween('src="', '"');
System.debug('Second substring: ' + secondSubString);
String link = secondSubString.replace('amp;', '');
System.debug('Link: ' + link);