anchor test: Transaction simulation failed: Error processing Instruction 0: Program failed to complete

[77ph]

git clone https://github.com/coral-xyz/multisig
cd multisig/
cargo install --git https://github.com/coral-xyz/anchor --tag v0.28.0 anchor-cli --locked
sudo apt-get update && sudo apt-get upgrade && sudo apt-get install -y pkg-config build-essential libudev-dev
anchor --version
anchor-cli 0.28.0

anchor build
anchor test                
    Finished release [optimized] target(s) in 0.15s

Found a 'test' script in the Anchor.toml. Running it as a test suite!

Running test suite: "/home/andrey/valory/multisig/Anchor.toml"



  multisig
    1) Tests the multisig program
    ✔ Assert Unique Owners (62ms)


  1 passing (1s)
  1 failing

  1) multisig
       Tests the multisig program:
     Error: failed to send transaction: Transaction simulation failed: Error processing Instruction 0: Program failed to complete
      at Connection.sendEncodedTransaction (node_modules/@solana/web3.js/lib/index.cjs.js:7339:13)
      at processTicksAndRejections (node:internal/process/task_queues:96:5)
      at async Connection.sendRawTransaction (node_modules/@solana/web3.js/lib/index.cjs.js:7300:20)
      at async sendAndConfirmRawTransaction (node_modules/@project-serum/anchor/dist/cjs/provider.js:172:23)
      at async AnchorProvider.sendAndConfirm (node_modules/@project-serum/anchor/dist/cjs/provider.js:88:20)
      at async Object.rpc [as executeTransaction] (node_modules/@project-serum/anchor/dist/cjs/program/namespace/rpc.js:15:24)
      at async Context.<anonymous> (tests/multisig.js:104:5)