gkm2012-04-13rrd1t01.flac:85042817aca142fc0fc928370f6ea30c gkm2012-04-13rrd1t02.flac:cd2a15f80c9b278fc6cd094b36ec52c3 gkm2012-04-13rrd1t03.flac:bbb4dc5f1afd07d2e6a17819727a45f5 gkm2012-04-13rrd1t04.flac:a4722dcfe5886ad19d0515dba22b88ef gkm2012-04-13rrd1t05.flac:d17e3b86117f3a3ed3445afb69cdb80a gkm2012-04-13rrd1t06.flac:29d26f369265d1e0b2e99a6b89dc432d App\Http\Controllers\Api\FileDownloadController::download(): Return value must be of type string, none returned