MultipartException: Current request is not a multipart request

I am trying to make a restful controller to upload files. I have seen thisand made this controller:

@RestControllerpublic class MaterialController {    @RequestMapping(value="/upload", method= RequestMethod.POST)    public String handleFileUpload(            @RequestParam("file") MultipartFile file){        String name = "test11";        if (!file.isEmpty()) {            try {                byte[] bytes = file.getBytes();                BufferedOutputStream stream =                        new BufferedOutputStream(new FileOutputStream(new File(name +"-uploaded")));                stream.write(bytes);                stream.close();                return "You successfully uploaded "+ name +" into "+ name +"-uploaded !";            } catch (Exception e) {                return "You failed to upload "+ name +" => "+ e.getMessage();            }        } else {            return "You failed to upload "+ name +" because the file was empty.";        }    }}

and then i used postman to send a pdf:

But the server crashes with the error:

.MultipartException: Current request is not a multipart request

Again i have found this, and added a bean.xml file

<?xml version="1.0" encoding="UTF-8"?><beans xmlns="http://www.springframework.org/schema/beans"       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd"><bean id="multipartResolver"          class="org.springframework.web.multipart.commons.CommonsMultipartResolver"></bean></beans>

Unfortunately, it still complains with the same error.