Error while configuring View Resolver for mustache template engine

Question

I have the following configuration file in spring-boot project :

@Configuration
public class AppConfig {
    @Bean
    public ViewResolver mustacheViewResolver() {
        MustacheViewResolver viewResolver = new MustacheViewResolver();
        viewResolver.setPrefix("/templates/");
        viewResolver.setSuffix(".mustache");
        viewResolver.setOrder(1);
        return viewResolver;
    }

}

When I run my application, I am getting the following error:
Description:

The bean 'mustacheViewResolver', defined in class path resource [org/springframework/boot/autoconfigure/mustache/MustacheServletWebConfiguration.class], could not be registered. A bean with that name has already been defined in class path resource [com/example/demo/AppConfig.class] and overriding is disabled.

Action:

Consider renaming one of the beans or enabling overriding by setting spring.main.allow-bean-definition-overriding=true
I am not sure if I am configuring the view Resolver properly

Error after removing the configuration class:

o.s.w.s.v.ContentNegotiatingViewResolver : Selected '*/*' given [*/*]
o.s.w.servlet.view.InternalResourceView  : View name 'tweets.mustache', model {tweets=null}
o.s.w.servlet.view.InternalResourceView  : Forwarding to [tweets.mustache]
o.s.web.servlet.DispatcherServlet        : "FORWARD" dispatch for GET "/[email protected]", parameters={masked}
 o.s.w.s.handler.SimpleUrlHandlerMapping  : Mapped to ResourceHttpRequestHandler [classpath [META-INF/resources/], classpath [resources/], classpath [static/], classpath [public/], ServletContext [/]]
 o.s.w.s.r.ResourceHttpRequestHandler     : Resource not found
 o.s.web.servlet.DispatcherServlet        : Exiting from "FORWARD" dispatch, status 404
 o.s.web.servlet.DispatcherServlet        : Completed 404 NOT_FOUND
 o.s.web.servlet.DispatcherServlet        : "ERROR" dispatch for GET "/[email protected]", parameters={masked}
 s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped to org.springframework.boot.autoconfigure.web.servlet.error.BasicErrorController#error(HttpServletRequest)
o.s.w.s.m.m.a.HttpEntityMethodProcessor  : Using 'application/json', given [*/*] and supported [application/json, application/*+json, application/json, application/*+json]
o.s.w.s.m.m.a.HttpEntityMethodProcessor  : Writing [{timestamp=, status=404, error=Not Found, path=/tweet2}]
o.s.web.servlet.DispatcherServlet        : Exiting from "ERROR" dispatch, status 404

 @GetMapping("/tweet2")
    public ModelAndView getTweetsByEmail(@RequestParam String email) {
        HQLExample.insertRecords();
        ModelAndView modelAndView = new ModelAndView("tweets.mustache");
        List<Tweet> tweets = tweetMap.get(email);
        modelAndView.getModel().put("tweets",tweets);
        return modelAndView;
    }