title: JSON Error "java.lang.IllegalStateException: Expected BEGIN_OBJECT but was STRING at line 1 column 1 path $"
body: <pre><code>public interface UserService {
      @POST(Constants.Api.URL_REGISTRATION)
      @FormUrlEncoded
      BaseWrapper registerUser(@Field("first_name") String firstname, @Field("last_name") String lastname, @Field("regNumber") String phone, @Field("regRole") int role);
  
  
   public BaseWrapper registerUser(User user) {
          return getUserService().registerUser(user.getFirstName(), user.getLastName(), user.getPhone(), user.getRole());
      }
  </code></pre>
  
  <p>This create Exception </p>
  
  <pre><code> com.google.gson.JsonSyntaxException: java.lang.IllegalStateException: Expected BEGIN_OBJECT but was STRING at line 1 column 1 path $
  </code></pre>
  
  <p>Big thanks for help.</p>