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Version: v2.x

Troubleshooting

cli: genProofs command failure​

Case: missing .dat files​

If your logs look like the following, then make sure you have ProcessMessages_10-2-1-2_test.dat and TallyVotes_10-1-2_test.dat files in the same directory as your zkeys:

node build/ts/index.js genProofs -x 0xf204a4Ef082f5c04bB89F7D5E6568B796096735a \
>     -sk macisk.49953af3585856f539d194b46c82f4ed54ec508fb9b882940cbe68bbc57e59e \
>     -o 0 \
>     -r ~/rapidsnark/build/prover \
>     -wp ./zkeys/ProcessMessages_10-2-1-2_test \
>     -wt ./zkeys/TallyVotes_10-1-2_test \
>     -zp ./zkeys/ProcessMessages_10-2-1-2_test.0.zkey \
>     -zt ./zkeys/TallyVotes_10-1-2_test.0.zkey \
>     -t tally.json \
>     -f proofs

fromBlock = 0
Generating proofs of message processing...
terminate called after throwing an instance of 'std::system_error'
  what():  open: No such file or directory
Aborted (core dumped)

terminate called after throwing an instance of 'std::system_error'
  what():  open: No such file or directory
Aborted (core dumped)

Error: could not generate proof.
Error: Error executing ./zkeys/ProcessMessages_10-2-1-2_test /tmp/tmp-9904-zG0k8YPTATWB/input.json /tmp/tmp-9904-zG0k8YPTATWB/output.wtns
    at genProof (/home/ubuntu/maci/circuits/ts/index.ts:44:15)
    at /home/ubuntu/maci/cli/ts/genProofs.ts:339:25
    at step (/home/ubuntu/maci/cli/build/genProofs.js:33:23)
    at Object.next (/home/ubuntu/maci/cli/build/genProofs.js:14:53)
    at fulfilled (/home/ubuntu/maci/cli/build/genProofs.js:5:58)

You can generate the missing .dat files using the following command:

pnpm build:circuits-c -- --outPath ../cli/zkeys

contracts: prove command failure​

Case Commitment mismatch​

If your log looks like the following, that's because you have already run the prove command. You can access the cli and attempt again by executing the genProofs command.

Error: commitment mismatch
    at Prover.validateCommitment (/home/user/Documents/maci/contracts/tasks/helpers/Prover.ts:458:13)
    at Prover.proveTally (/home/user/Documents/maci/contracts/tasks/helpers/Prover.ts:390:12)
    at processTicksAndRejections (node:internal/process/task_queues:95:5)
    at async SimpleTaskDefinition.action (/home/user/Documents/maci/contracts/tasks/runner/prove.ts:235:7)
    at async Environment._runTaskDefinition (/home/user/Documents/maci/node_modules/.pnpm/[email protected][email protected][email protected]/node_modules/hardhat/src/internal/core/runtime-environment.ts:359:14)
    at async Environment.run (/home/user/Documents/maci/node_modules/.pnpm/[email protected][email protected][email protected]/node_modules/hardhat/src/internal/core/runtime-environment.ts:192:14)
    at async main (/home/user/Documents/maci/node_modules/.pnpm/[email protected][email protected][email protected]/node_modules/hardhat/src/internal/cli/cli.ts:323:7)
 ELIFECYCLE  Command failed with exit code 1.
 ELIFECYCLE  Command failed with exit code 1.

This is because commitments are generated using random salts, thus will differ at each genProofs run.

In core/Poll.ts:

let newSbSalt = genRandomSalt();
while (this.sbSalts[this.currentMessageBatchIndex!] === newSbSalt) {
  newSbSalt = genRandomSalt();
}

General Failure​

Case AssertionError​

This could happen when you run prove in the contracts package, or run genProofs in the cli package. If your log looks like the following, there are two possible reasons:

  1. If your MACI keypair for the coordinator was generated based on a previous version, it may have been generated incorrectly due to a breaking change in a third-party package (zk-kit/eddsa-poseidon). Please generate a new pair and run the whole process again.
  2. The provided private key is unmatched to the public key which deployed the poll, you will need to input the correct private key.
An unexpected error occurred:

AssertionError [ERR_ASSERTION]: false == true
    at genMaciStateFromContract (/home/user/Documents/maci/contracts/ts/genMaciState.ts:156:9)
    at processTicksAndRejections (node:internal/process/task_queues:95:5)
    at async SimpleTaskDefinition.action (/home/user/Documents/maci/contracts/tasks/runner/prove.ts:127:25)
    at async Environment._runTaskDefinition (/home/user/Documents/maci/node_modules/.pnpm/[email protected][email protected][email protected]/node_modules/hardhat/src/internal/core/runtime-environment.ts:359:14)
    at async Environment.run (/home/user/Documents/maci/node_modules/.pnpm/[email protected][email protected][email protected]/node_modules/hardhat/src/internal/core/runtime-environment.ts:192:14)
    at async main (/home/user/Documents/maci/node_modules/.pnpm/[email protected][email protected][email protected]/node_modules/hardhat/src/internal/cli/cli.ts:323:7) {
  generatedMessage: true,
  code: 'ERR_ASSERTION',
  actual: false,
  expected: true,
  operator: '=='
}

Cannot filter non-indexed parameters​

If you encountered the following error log:

TypeError: cannot filter non-indexed parameters; must be null (argument="contract._messageRoot", value=4658669366154318429589992378027343879410506110087584229116806667655891474709, code=INVALID_ARGUMENT, version=6.11.1)
    at makeError (/home/user/Documents/maci/node_modules/.pnpm/[email protected]/node_modules/ethers/src.ts/utils/errors.ts:687:21)
    at assert (/home/user/Documents/maci/node_modules/.pnpm/[email protected]/node_modules/ethers/src.ts/utils/errors.ts:715:25)
    at assertArgument (/home/user/Documents/maci/node_modules/.pnpm/[email protected]/node_modules/ethers/src.ts/utils/errors.ts:727:5)
    at /home/user/Documents/maci/node_modules/.pnpm/[email protected]/node_modules/ethers/src.ts/abi/interface.ts:1047:31
    at Array.forEach (<anonymous>)
    at Interface.encodeFilterTopics (/home/user/Documents/maci/node_modules/.pnpm/[email protected]/node_modules/ethers/src.ts/abi/interface.ts:1042:16)
    at /home/user/Documents/maci/node_modules/.pnpm/[email protected]/node_modules/ethers/src.ts/contract/contract.ts:108:39
    at processTicksAndRejections (node:internal/process/task_queues:95:5)
    at async getSubInfo (/home/user/Documents/maci/node_modules/.pnpm/[email protected]/node_modules/ethers/src.ts/contract/contract.ts:502:18)
    at async Proxy.queryFilter (/home/user/Documents/maci/node_modules/.pnpm/[email protected]/node_modules/ethers/src.ts/contract/contract.ts:938:38) {
  code: 'INVALID_ARGUMENT',
  argument: 'contract._messageRoot',
  value: 4658669366154318429589992378027343879410506110087584229116806667655891474709n,
  shortMessage: 'cannot filter non-indexed parameters; must be null'
}

This could happen during running genProofs in cli package, or running prove in contracts package. Be aware that we updated several parameters to indexed:

event MergeMaciStateAqSubRoots(uint256 indexed _numSrQueueOps);
event MergeMaciStateAq(uint256 indexed _stateRoot, uint256 indexed _numSignups);
event MergeMessageAqSubRoots(uint256 indexed _numSrQueueOps);
event MergeMessageAq(uint256 indexed _messageRoot);

Please remember to pull the latest MACI repo updates(git fetch origin && git pull origin dev) and run pnpm build in the root of this monorepo.

Verifier contract found the proof invalid​

If your log looks like the following, that's because the zkey and wasm files added to the VkRegistry contract are different from what you use to run the prove command. Check if you're using the correct zkey and wasm files.

Error: The verifier contract found the proof invalid.
    at Prover.proveMessageProcessing (/home/user/Documents/maci/contracts/tasks/helpers/Prover.ts:215:15)
    at processTicksAndRejections (node:internal/process/task_queues:95:5)
    at async SimpleTaskDefinition.action (/home/user/Documents/maci/contracts/tasks/runner/prove.ts:185:7)
    at async Environment._runTaskDefinition (/home/user/Documents/maci/node_modules/.pnpm/[email protected][email protected][email protected]/node_modules/hardhat/src/internal/core/runtime-environment.ts:359:14)
    at async Environment.run (/home/user/Documents/maci/node_modules/.pnpm/[email protected][email protected][email protected]/node_modules/hardhat/src/internal/core/runtime-environment.ts:192:14)
    at async main (/home/user/Documents/maci/node_modules/.pnpm/[email protected][email protected][email protected]/node_modules/hardhat/src/internal/cli/cli.ts:323:7)

The on-chain verification of total spent voice credits failed​

If you ran the verify command and got this error, please ensure consistency in your use of quadratic voting throughout interactions with MACI, including poll deployment, proof generation, and verification.