78d7e64d786ad08558262608907b8dfa [shntool] gd94-04-06t01snchk.shn cf3d4758146b65ef06245e87f0e7195e [shntool] gd94-04-06t02snchk.shn 1db7fbbaad18514af28313ec0727ce59 [shntool] gd94-04-06t03snchk.shn App\Http\Controllers\Api\ChecksumDownloadController::download(): Return value must be of type string, none returned