Error sending keygen transactions ReturnValueInvalid

[SurfingNerd]

This happens if the network is booted up with the moc.
Does it happen only with the MOC ??

2021-08-05 02:45:13  Worker Hbbft0 TRACE engine  checking for acks...
2021-08-05 02:45:13  Worker Hbbft0 ERROR engine  could not retrieve part for 0x386f…f22d call failed. Error: ReturnValueInvalid
2021-08-05 02:45:13  Worker Hbbft0 ERROR engine  Error sending keygen transactions ReturnValueInvalid

[SurfingNerd]

no, experienced on testnet-alpha-4 as well.

2021-08-10 16:54:39  Verifier #0 TRACE engine  preparing to send PARTS for upcomming epoch: 2
2021-08-10 16:54:39  Verifier #0 TRACE engine  checking for acks...
2021-08-10 16:54:39  Verifier #0 ERROR engine  could not retrieve part for 0xd556��315f call failed. Error: ReturnValueInvalid
2021-08-10 16:54:39  Verifier #0 ERROR engine  Error sending keygen transactions ReturnValueInvalid
2021-08-10 16:54:39  Verifier #0 TRACE consensus  calling reward function for block 29 isEpochEnd? false on address: 0x2000��0001
2021-08-10 16:54:39  Verifier #0 TRACE txqueue  Refreshing certified addresses cache

The parts are written, but the node still complains:
could not retrieve part for 0xd556��315f call failed. Error: ReturnValueInvalid

[SurfingNerd]

happened with hbbft18 during testnet:
fun fact: he could not read his own part.

2021-08-26 12:00:58  Verifier #0 ERROR engine  could not retrieve part for 0x0ea7…fba6 call failed. Error: ReturnValueInvalid
2021-08-26 12:01:06  Verifier #3 ERROR engine  could not retrieve part for 0x0ea7…fba6 call failed. Error: ReturnValueInvalid
2021-08-26 12:01:13  Verifier #2 ERROR engine  could not retrieve part for 0x0ea7…fba6 call failed. Error: ReturnValueInvalid
2021-08-26 12:01:19  Verifier #0 ERROR engine  could not retrieve part for 0x0ea7…fba6 call failed. Error: ReturnValueInvalid
2021-08-26 12:01:26  Verifier #2 ERROR engine  could not retrieve part for 0x0ea7…fba6 call failed. Error: ReturnValueInvalid
2021-08-26 12:01:33  Verifier #1 ERROR engine  could not retrieve part for 0x0ea7…fba6 call failed. Error: ReturnValueInvalid
2021-08-26 12:06:22  Worker Hbbft3 TRACE engine  We are not part of the HoneyBadger validator set - running as regular node.

[SurfingNerd]

maybe connected with an epoch that hat multiple key generation rounds ?
so this could solve the problem:: #46

[SurfingNerd]

It happens on pending validators that just wait for other nodes to write their parts - or for waiting until it's own parts are getting included.

[SurfingNerd]

returning none instead of Err in part_of_address would reduce the error outpiut in the logfile - since it is not really an error.

    if serialized_part.is_empty() {
        return Err(CallError::ReturnValueInvalid);
    }

update to:

    if serialized_part.is_empty() {
        return Ok(None);
    }
´´´