Web3.py – ERC1155 Validation Error Code: -32000 Explained

web3.py

I am using web3py to make a transaction. But I am getting validation error:

{'message': 'VM Exception while processing transaction: revert Need
operator approval for 3rd party transfers.', 'code': -32000, 'data':
{'stack': 'RuntimeError: VM Exception while processing transaction:
revert Need operator approval for 3rd party transfers.\n at
Function.RuntimeError.fromResults
(/Applications/Ganache.app/Contents/Resources/static/node/node_modules/ganache-core/lib/utils/runtimeerror.js:89:13)\n
at module.exports
(/Applications/Ganache.app/Contents/Resources/static/node/node_modules/ganache-core/lib/utils/gas/guestimation.js:142:32)',
'name': 'RuntimeError'}}

Can someone please help me understand this error? Why is it happening?
I am using function safeTransferFrom (from ERC1155)

Thank you.

Best Answer

If we refer to the doc (https://github.com/ethereum/EIPs/blob/master/EIPS/eip-1155.md), we can read in the definition of the safeTransferFrom function :

Caller must be approved to manage the tokens being transferred out of the _from account

The user passed to the _from parameter of safeTransferFrom has therefore to first approve the caller using setApprovalForAll(address _operator, bool _approved) with :

_operator the address of the safeTransferFrom caller which can be either an EOA or a smart contract
_approved set to true.

To resume:

UserA approves UserB/smart contract and authorizes him/it to transfer his funds
The approved UserB/smart contract can now transfer the funds of UserA
UserA can "disapprove" at any time UserB/smart contract by sending a new setApprovalForAll transaction with _approved set to false.

Related Solutions

[Ethereum] Getting this error `ValueError: {‘code’: -32000, ‘message’: ‘insufficient funds for gas * price + value’}` on raw transaction send

The fact that you are not setting the data field implies that you are interested only in sending ether (rather than in executing a contract function).

If the destination address is of an externally-owned account, then you only need 21000.

If the destination address is of a smart-contract account, then you need slightly more than 21000.

However, even when the transaction requires much less gas for executing, configuring it with 'gas': 2000000 requires that you actually have the corresponding amount of ether (gas * gas price + value) in the account whose private key you are using in order to sign the transaction.

And although this account will not be charged that extra amount of gas, you still need to have the corresponding amount of ether (gas * gas price + value) in it.

Web3.py Error – ValueError: {‘code’: -32000, ‘message’: ‘already known’}

Partial answer...

I'm assuming this means that this transaction is already in the mempool or something?

Yes. From tx_pool.go:

// ErrAlreadyKnown is returned if the transactions is already contained
// within the pool.
ErrAlreadyKnown = errors.New("already known")

But it's not immediately clear from the code what conditions have to be met for this error to be set, so it's difficult to suggest a solution.

Best Answer

Related Solutions

[Ethereum] Getting this error `ValueError: {‘code’: -32000, ‘message’: ‘insufficient funds for gas * price + value’}` on raw transaction send

Web3.py Error – ValueError: {‘code’: -32000, ‘message’: ‘already known’}

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