Thymeleaf error templates in Heroku

I implemented my application in Heroku, just for testing ... Locally everything works fine, but in Heroku after I log in with the credentials I'm directed to the sac/index page, which is correct, but me returns:

  

"Whitelabel Error Page

     

This application has no explicit mapping for / error, so you are seeing   this as a fallback.

     

Tue May 30 19:56:32 UTC 2017 There was an unexpected error   (type = Internal Server Error, status = 500). Error resolving template   "/ sac / index", template might not exist or might not be accessible by   any of the configured Template Resolvers "

However, when I access another page as /sac/listUsers it works normally.

This is my Controller:

@RequestMapping("/sac/index")
public ModelAndView home(){
    ModelAndView modelAndView = new ModelAndView();
    Authentication auth = SecurityContextHolder.getContext().getAuthentication();
    User user = userService.findUserByEmail(auth.getName());
    modelAndView.addObject("userName", user.getName() + " (" + user.getEmail() + ")");
    modelAndView.setViewName("/sac/index");
    return modelAndView;
}

My http settings:

@Override
protected void configure(HttpSecurity http) throws Exception {      
    http.
        authorizeRequests()
            .antMatchers("/").permitAll()
            .antMatchers("/login").permitAll()              
            .antMatchers("/sac/registration").hasAuthority("ADMIN")
            .antMatchers("/sac/consultarUsuarios").hasAuthority("ADMIN")
            .antMatchers("/sac/index").hasAnyAuthority("ADMIN", "SUPPORT")
            .antMatchers("/sac/**").hasAnyAuthority("ADMIN", "SUPPORT").anyRequest()                
            .authenticated().and().csrf().disable().formLogin()
            .loginPage("/login").failureUrl("/login?error=true")
            .defaultSuccessUrl("/sac/index")
            .usernameParameter("email")
            .passwordParameter("password")
            .and().logout()
            .logoutRequestMatcher(new AntPathRequestMatcher("/logout"))
            .logoutSuccessUrl("/login").and().exceptionHandling()
            .accessDeniedPage("/access-denied");
}

Pom.xml:

<build>
    <plugins>
        <plugin>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-maven-plugin</artifactId>

            <executions>
                <execution>
                    <goals>
                        <goal>repackage</goal>
                    </goals>
                    <configuration>
                        <finalName>${project.artifactId}</finalName>
                    </configuration>
                </execution>
            </executions>
        </plugin>


        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-jar-plugin</artifactId>
            <configuration>
                <finalName>${project.artifactId}</finalName>
            </configuration>
        </plugin>
    </plugins>

</build>

Application.properties:

# ===============================
# = Thymeleaf configurations
# ===============================
spring.thymeleaf.enabled=true
spring.thymeleaf.check-template-location=true
spring.thymeleaf.prefix=classpath:/templates/
spring.thymeleaf.suffix=.html
spring.thymeleaf.mode=LEGACYHTML5
spring.thymeleaf.encoding=UTF-8
spring.thymeleaf.content-type=text/html
spring.thymeleaf.cache=false

Does anyone know what I'm doing wrong?