The current message does not really helps if the blockkey is wrong and does not permit to read the FS data:
$ ./dist/mirage_sshfs --port 22022 --user username --seed 111213 --blockkey 1234567890ABCDEF1234567890ABCDEE -l debug
2022-04-17 18:44:16 +02:00: INF [tcpip-stack-socket] Dual IPv4 and IPv6 socket stack: connect
Fatal error: exception Failure("error reading essential sectors: decrypt error")
Raised at Lwt.Miscellaneous.poll in file "duniverse/lwt/src/core/lwt.ml", line 3068, characters 20-29
Called from Unix_os__Main.run in file "duniverse/mirage-unix/lib/main.ml", line 5, characters 8-18
Called from Dune__exe__Main.run in file "main.ml", line 3, characters 12-30
Called from Dune__exe__Main in file "main.ml", line 139, characters 5-10
The current message does not really helps if the blockkey is wrong and does not permit to read the FS data: