342ba8ad42e2f8eb4fa6210d4e42d9c4 [shntool] gd1968-12-16d1t01.shn 7cb0e628354319dffe59e72c70518648 [shntool] gd1968-12-16d2t01.shn App\Http\Controllers\Api\ChecksumDownloadController::download(): Return value must be of type string, none returned