@Raj Vakati

I am not getting Error but not getting output also Please have a look for complete code
<aura:component implements="force:appHostable"  controller="ContactsController">
     <aura:handler name="init" action="{!c.doInit}" value="{!this}"/>    
    <aura:attribute name="cnts" type="contact[]"/>   
    <aura:Iteration var="con" Items="{!v.cnts}">
        {!con.firstName}
    </aura:Iteration>
    
</aura:component>

({
           // Load expenses from Salesforce
    doInit: function(component, event, helper) {
        alert('hi');
        // Create the action
        var action = component.get("c.getAllContact");
        // Add callback behavior for when response is received
        action.setCallback(this, function(response) {
            var state = response.getState();
            if (state === "SUCCESS") {
                component.set("v.cnts", response.getReturnValue());
                console.log(response.getReturnValue());
            }
            else {
                console.log("Failed with state: " + state);
            }
        });
        // Send action off to be executed
        $A.enqueueAction(action);
    }
    
})

public  class ContactsController {
@AuraEnabled
   public static List<Contact> GetAllContactsByName(String searchText)   {
       String searchString = '%' + searchText + '%';
       List<Contact> contactList = [SELECT FirstName, LastName, Phone, Email, Title, Account.Name FROM Contact where FirstName like :searchString];
       return contactList;
   }
     @AuraEnabled
    public static List<contact> getAllContact(){
        List<contact> lstContact=[Select firstName,LastName, Phone, Email, Title,Account.Name from contact];
        return lstcontact;
    }
}


<aura:application extends="force:slds">
    <c:TestComponent />    
</aura:application>