INVALID_KEY

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

[Error Code: 1006] invalid proposal key: public key 0 on account 7f60e8e0fa99a9b5 does not have a valid signature: [Error Code: 1009] invalid envelope key: public key 0 on account 7f60e8e0fa99a9b5 does not have a valid signature: signature is not va