Dissolve in one step return Err

Seed round investor wish to unstake to dissolve:

CANISTER=rrkah-fqaaa-aaaaa-aaaaq-cai
RESULT="$(dfx canister --network=https://ic0.app --no-wallet call $CANISTER manage_neuron “(record { id = opt record { id = $NEURON_ID:nat64 }; command = opt variant { Configure = record { operation = opt variant { StartDissolving = record {} } } } })” --output=raw)"
didc decode -t “(ManageNeuronResponse)” -d ~/Downloads/nns-ifaces-0.8.0/governance.did $RESULT

return Err:

(
record {
command = opt variant {
Error = record { error_message = “”; error_type = 6 : int32 }
};
},
)

What happened?

It looks like that neuron is already fully dissolved. You may want to move on to the “Disburse ICP from neurons that are fully dissolved” step, here:
https://github.com/dfinity/docs/blob/master/modules/token-holders/pages/seed-donations.adoc#disburse-icp-from-neurons-that-are-fully-dissolved

@Ori is correct. For hints on error codes you can check the code. Error 6 is:

ERROR_TYPE_REQUIRES_LOCKED = 6;
// The neuron is not dissolving and the operation requires it to be
// dissolving.
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