Error: Debot failed: Contract execution was terminated with error: Unknown error, exit code: 75

[ilyar]

pragma ton-solidity >= 0.57.3;
pragma AbiHeader expire;
pragma AbiHeader time;
pragma AbiHeader pubkey;

interface IContract {
    function foo() external responsible pure returns (string);
}

contract Example {
    function foo() external responsible pure returns (string) {
        return "foo42";
    }
    // minimal DeBot
    string s_dabi;
    function setABI(string dabi) public {
        require(tvm.pubkey() == msg.pubkey(), 100);
        tvm.accept();
        s_dabi = dabi;
    }
    function getDebotOptions() public view returns (
        uint8 options, string debotAbi, string targetAbi, address targetAddr
    ) {
        debotAbi = s_dabi;
        targetAbi = "";
        targetAddr = address(0);
        options = 1;
    }

    function onFoo(string data) public pure {
        tvm.log(format("onFoo: {}", data));
    }

    function start() public pure {
        tvm.log("start");
        IContract(address(this)).foo{
            callback: onFoo
        }();
        // FIXME IContract(address(this)).foo().await;
        tvm.log("end");
    }

    function getDebotInfo() public functionID(0xDEB) view returns(
        string name, string version, string publisher, string caption, string author,
        address support, string hello, string language, string dabi, bytes icon
    ) {
        tvm.log("getDebotInfo");
        name = "Example";
        version = "1.0.0-alpha.0";
        publisher = "Everscale";
        caption = "My first DeBot";
        author = "Everscale";
        support = address.makeAddrStd(0, 0x0);
        hello = "Hello first user!";
        language = "en";
        dabi = s_dabi;
        icon = "";
    }
}

Run log:

19:31:10 [DEBUG] (1) ton_client::debot::dengine: running getRequiredInterfaces, addr 0:3aee4ccbf6411dc31e48c610ff78ce0e480e1f156d20c04ec88c690657dd0a45
19:31:10 [DEBUG] (1) ton_client::debot::dengine: running getDebotInfo, addr 0:3aee4ccbf6411dc31e48c610ff78ce0e480e1f156d20c04ec88c690657dd0a45
19:31:10 [INFO] getDebotInfo
19:31:10 [DEBUG] (1) ton_client::debot::dengine: run_debot_external getDebotOptions, args: {}
19:31:10 [DEBUG] (1) ton_client::debot::dengine: running getDebotOptions, addr 0:3aee4ccbf6411dc31e48c610ff78ce0e480e1f156d20c04ec88c690657dd0a45
19:31:10 [DEBUG] (1) ton_client::debot::dengine: run_debot_external fetch, args: {}
19:31:10 [DEBUG] (1) ton_client::debot::dengine: running fetch, addr 0:3aee4ccbf6411dc31e48c610ff78ce0e480e1f156d20c04ec88c690657dd0a45
19:31:10 [ERROR] Create run message failed: Invalid name: fetch
19:31:10 [DEBUG] (1) ton_client::debot::dengine: switching to 0
19:31:10 [DEBUG] (1) tonos_cli::debot::callbacks: switched to ctx 0

19:31:10 [DEBUG] (1) ton_client::debot::dengine: run_action: start
19:31:10 [DEBUG] (1) ton_client::debot::dengine: run_debot_external start, args: {}
19:31:10 [DEBUG] (1) ton_client::debot::dengine: running start, addr 0:3aee4ccbf6411dc31e48c610ff78ce0e480e1f156d20c04ec88c690657dd0a45
19:31:10 [INFO] start
19:31:10 [INFO] end
19:31:10 [DEBUG] (1) ton_client::debot::dengine: Invoke call
19:31:10 [DEBUG] (1) ton_client::debot::dengine: instant_switch = false, state_to = 0
19:31:10 [DEBUG] (1) ton_client::debot::dengine: Invoke call
19:31:10 [INFO] onFoo: foo42

19:31:10 [DEBUG] (1) tonos_cli::debot::callbacks: no more actions, exit loop

If use IContract(address(this)).foo().await; run log:

19:38:12 [DEBUG] (1) ton_client::debot::dengine: running getRequiredInterfaces, addr 0:7aa981052eeb3022d5752567b593ed9bb260e926f5dc105f0daeb2646d73689a
19:38:12 [DEBUG] (1) ton_client::debot::dengine: running getDebotInfo, addr 0:7aa981052eeb3022d5752567b593ed9bb260e926f5dc105f0daeb2646d73689a
19:38:12 [INFO] getDebotInfo
19:38:12 [DEBUG] (1) ton_client::debot::dengine: run_debot_external getDebotOptions, args: {}
19:38:12 [DEBUG] (1) ton_client::debot::dengine: running getDebotOptions, addr 0:7aa981052eeb3022d5752567b593ed9bb260e926f5dc105f0daeb2646d73689a
19:38:12 [DEBUG] (1) ton_client::debot::dengine: run_debot_external fetch, args: {}
19:38:12 [DEBUG] (1) ton_client::debot::dengine: running fetch, addr 0:7aa981052eeb3022d5752567b593ed9bb260e926f5dc105f0daeb2646d73689a
19:38:12 [ERROR] Create run message failed: Invalid name: fetch
19:38:12 [DEBUG] (1) ton_client::debot::dengine: switching to 0
19:38:12 [DEBUG] (1) tonos_cli::debot::callbacks: switched to ctx 0

19:38:12 [DEBUG] (1) ton_client::debot::dengine: run_action: start
19:38:12 [DEBUG] (1) ton_client::debot::dengine: run_debot_external start, args: {}
19:38:12 [DEBUG] (1) ton_client::debot::dengine: running start, addr 0:7aa981052eeb3022d5752567b593ed9bb260e926f5dc105f0daeb2646d73689a
19:38:12 [INFO] start
19:38:12 [DEBUG] (1) ton_client::debot::dengine: Invoke call
19:38:12 [DEBUG] (1) ton_client::debot::dengine: instant_switch = false, state_to = 0
Error: Debot failed: Contract execution was terminated with error: Unknown error, exit code: 75.
Tip: For more information about exit code check the contract source code or ask the contract developer
Error: 1