Error codes / Metaplex Token Metadata
MintSupplyMustBeZero
Metaplex Token Metadata · Custom(160) · 0xa0
custom program error: 0xa0
What it means
Mint supply must be zero for programmable assets
What to do
The error name is the program's own diagnosis. Paste the failed transaction into TxWhy to see which instruction raised it and with which accounts.
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).