One of the keys used in this transaction is not valid.
[Error Code: 1008] error caused by: 1 error occurred:
* transaction verification failed: [Error Code: 1006] invalid proposal key: public key 0 on account a821c5164f28d2b8 does not have a valid signature: [Error Code: 1008] invalid payload signature: public key 0 on account a821c5164f28d2b8 does not have a valid signature: signature is not valid