One of the accounts in this transaction does not have enough flow to pay for storage. Ensure that the account you are adding data to has enough flow before trying again.
[Error Code: 1103] error caused by: 1 error occurred:
* [Error Code: 1103] The account with address (6440b965740e61b9) uses 1335 bytes of storage which is over its capacity (0 bytes). Capacity can be increased by adding FLOW tokens to the account.