Using suspend in interface retrofit2 error : No JsonAdapter for retrofit2.Call

error happen when using suspend

 ```
@POST("permohonanUjiLab")
  suspend fun postpermohonanuji(@Body task: Reqpengajuanlab?): Call<responsepengajuanlab>
```
but it working if suspend remove


 ```
@POST("permohonanUjiLab")
  fun postpermohonanuji(@Body task: Reqpengajuanlab?): Call<responsepengajuanlab>
```