1f823b120ae1d5123f3b28a49aa2335e *duo2003-05-23d1t01.shn f3eb373dedc07574c9244d4c71f4d1c2 *duo2003-05-23d1t02.shn 17dd6224e0bee354ac4caec6680544fd *duo2003-05-23d1t03.shn 04617f6d796e063fe832930bd573274c *duo2003-05-23d1t04.shn App\Http\Controllers\Api\ChecksumDownloadController::download(): Return value must be of type string, none returned