[FIXED] Send request has two type parameters (Query, Multipart/form-data)

Issue

I have been tyring to execute API has two parameters as I said in title here is my API configure

//region SignUp
String SIGN_UP_USER = "User/SignUp";

@POST(SIGN_UP_USER)
@Multipart
@Headers("Content-Type: application/json")
Call<SignUpResponse> signUp(
        @Part MultipartBody.Part profilePicture,
        @Query("email") String email,
        @Query("password") String password,
        @Query("firstName") String firstName,
        @Query("lastName") String lastName);
//endregion

But when I execute the request I got this error:
java.lang.IllegalStateException: Multipart body must have at least one part.

And here is the details of request from Swagger

Any suggestions for this issue,
Thanks in advance

Solution

All what I did to fix my problem was remove this Annotation

@Headers("Content-Type: application/json")  

from my code and request.
and for sending empty files you can just send a null parameter for file will take it as empty.

Answered By - mustafa hasria
Answer Checked By - Mary Flores (JavaFixing Volunteer)