gkm2012-03-23d1t01.flac:81ab83ab561d88f67fb051a7284e694d gkm2012-03-23d1t02.flac:474086612e4315694fdc582fad0b3047 gkm2012-03-23d1t03.flac:bb988cd138ffad830b21487dce2c30c1 gkm2012-03-23d1t04.flac:4b034787d32db4741b9e8f618f574dcd gkm2012-03-23d1t05.flac:8597cea9e83d52565d0c62d7d74fed52 gkm2012-03-23d1t06.flac:80bfdba2da8fe9077e596a61a2d7b56c gkm2012-03-23d1t07.flac:bb3fb8670c50fad8d4c1742c48e4e95d gkm2012-03-23d1t08.flac:db04e988a57b657b5dba6e69b6e9f88c App\Http\Controllers\Api\FileDownloadController::download(): Return value must be of type string, none returned