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Error handling

This page details how to address the common errors that may be thrown when interacting with =nil;. These errors are either not present in Ethereum or the circumstances when they are thrown differ from Ethereum.

There are two ways the =nil; CLI can display errors:

  • As direct responses from the RPC node appearing in the command output
  • In message receipts

If an error is thrown by the RPC node, the =nil; CLI will output the error code and the error description:

failed to send message: rpc error: {"code":-32000,"message":"message status: not replaced"}

If an error is thrown by the cluster, use the nil receipt HASH --shard-id SHARD_ID command to see its description in the message receipt:

{
    ...
    "errorMessage": "execution reverted: Insufficient balance"
    ...
}

Message status: not replaced​

The "message status: not replaced" error is thrown when two messages with the same seqno and made to the same contract are sent to the message pool.

To resolve the error:

  • When using the CLI manually: retry the operation after several seconds
  • When using the CLI in a pipeline or a script: add mandatory delays between CLI commands

Execution reverted​

The "execution reverted" error is thrown when the execution of a message encounters an issue and cannot be continued further.

The most probable causes of the error:

  • There is a require() statement in a contract that the message data fails to pass
  • A function with an onlyInternal or an onlyExternal modifier is called with an incorrect message type
  • Any kind of internal contract logic is not being executed correctly
  • A message with a non-zero value is attempting to call a function not marked as payable

To resolve the error:

  • Double-check the contract logic and, if possible, remove unnecessary require() statements
  • Ensure that the correct FORWARD_KIND is used in async calls, which should guarantee that contracts can pay for chains of two or more async calls
  • Remove onlyInternal or onlyExternal modifiers and rerun the message chain
  • Make sure that messages with a non-zero value only call payable functions

Invalid payload​

The "invalid payload" error is thrown when the message payload cannot be parsed by the RPC node. This usually occurs if the payload has an incorrect size.

To resolve the error:

  • Double-check the contract ABI and make sure that the way the message data is encoded matches it

Failed to pack method call​

The "failed to pack method call" error is thrown when the message inputs do not match the contract ABI.

The most probable causes of the error:

  • The method that the message is trying to call does not exist
  • An incorrect number of arguments is passed in the message
  • Arguments of the wrong type are passed in the message

The error will specify the exact reason when it is thrown.

To resolve the error:

  • Check that the correct ABI is used in the call
  • Look for any typos in the method name that is used in the call
  • Ensure that the correct number of arguments are passed in the message
  • Change the argument types to match the ABI

KEY not specified in config​

The `"KEY not specified in config" error is thrown when the CLI configuration file lacks one of the following keys:

  • rpc_endpoint
  • private_key
  • address

To resolve the error, execute the following command(s) depending on which key is missing:

nil keygen new
nil wallet new
nil config set rpc_endpoint RPC_ENDPOINT

Out of gas​

The "out of gas" error is thrown when the message cannot pay for its own execution.

To resolve the error:

Contract address collision​

The "contract address collision" error is thrown when there is an attempt to deploy a contract to an address that is already occupied.

To resolve the error:

  • Pass a different SALT to the contract deployment message
  • Deploy the contract on a different shard

External message verification failed​

The "external message verification failed" error is thrown when an external message cannot pass the verification check in the verifyExternal() function of the contract that this message calls. For example, this error appears when attempting to send a message via a wallet while using the wrong keypair for this wallet.

To resolve this error:

  • Double-check the contents of the =nil; CLI config file and ensure that the file contains the correct private key
  • Check the verification logic inside the verifyExternal() function of the contract being called and adjust the message accordingly

Attempt to deploy to main shard from non-system wallet​

The "attempt to deploy to main shard from non-system wallet" error is thrown when a smart contract makes a deploy request to the main shard. Deployments to the main shard are prohibited.

To resolve the error:

  • Specify a different --shard-id when making the deployment request

Message fee forwarding failed​

The "message fee forwarding failed" error is thrown when there is an issue with gas forwarding across several contracts.

To resolve the error:

  • Trace the chain of async calls and, if necessary, change the FORWARD_KIND used in the contracts being called
  • Increase the feeCredit used in async call chains