INVALID_KEY

One of the keys used in this transaction is not valid.

[Error Code: 1006] invalid proposal key: public key 6236 on account 55ad22f01ef568a1 does not have a valid signature: [Error Code: 1008] invalid payload signature: public key 6 on account 36fde4c7d2a5731d does not have a valid signature: signature is not va