Error codes / Anchor framework
AccountDidNotDeserialize
Anchor framework · Custom(3003) · 0xbbb
custom program error: 0xbbb
What it means
The account data failed to deserialize into the expected type.
What to do
Account layout drift — verify program version and account address.
Have the transaction that failed with this?
Paste its signature. TxWhy shows the exact instruction and inner call that raised the error, and rebuilds the transaction when the cause is one it can fix (compute limit, expired blockhash, priority fee, stale swap quote).