gkm2012-04-19-12d1t01.flac:6e64c7d8bafc92a3dfadc441aafc3230 gkm2012-04-19-12d1t02.flac:2c4d5c89348f504065f7085a2dc14a81 gkm2012-04-19-12d1t03.flac:a64dba5e0321df67162f5a0d46d9004a gkm2012-04-19-12d1t04.flac:cdc2c9447c49e39c6cf1d41a8454d220 gkm2012-04-19-12d1t05.flac:8879bbbe392f43b1e7dde61dc801d52d gkm2012-04-19-12d1t06.flac:c929562ec8d06701b7b563c019371c32 App\Http\Controllers\Api\FileDownloadController::download(): Return value must be of type string, none returned