Android Question Error when SetHeaders HttpJob with Special Characters 'Ñ'

java.lang.IllegalArgumentException: Unexpected char 0xf1 at 4 in user value: baño

Dim j As HttpJob
        j.Initialize("", Me)
        Dim fd As MultipartFileData
        fd.Initialize
        fd.KeyName = "file"
        fd.Dir = File.DirInternal
        fd.FileName = "file.jpg"
        fd.ContentType = "image/jpg"
        j.PostMultipart(posturl, null, Array(fd))
        j.GetRequest.SetHeader("user", "baño")
        Wait For (j) JobDone(j As HttpJob)
        If j.Success Then
            Log(j.GetString)
        End If
        j.Release