question about post_upgrade failed

[cymqqqq]

Hi there, I wrote my own post_upgrade code by researching the openchat post_upgrade, but it prints: Error: Failed while trying to deploy canisters. Caused by: Failed while trying to deploy canisters. Failed while trying to install all canisters. Failed to install wasm module to canister 'user'. Failed during wasm installation call: The replica returned a replica error: Replica Error: reject code CanisterError, reject message Canister g5fwl-3aaaa-aaaah-adtlq-cai trapped explicitly: Panicked at 'called Result::unwrap() on an Err value: InvalidMarkerRead(Error { kind: UnexpectedEof, message: "failed to fill whole buffer" })', src/user/impl/src/lifecycle/post_upgrade.rs:18:53, error code None I don't know why, here is my code: #[post_upgrade] fn post_upgrade() { let env = init_env(); let memory = get_upgrade_memory();

let reader = get_reader(&memory);
let data: Data= serializer::deserialize(reader).unwrap();
init_state(env, data);

reset_memory_manager();
info!("Post-upgrade complete");

}