[BUG] `estimate_fee_sync` always fails with `TRANSACTION_FAILED`

Python version

3.9.12

Expected Behavior

estimate_fee_sync should successfully complete

Current Behavior

It returns the following error:

{"code": "StarknetErrorCode.TRANSACTION_FAILED", "message": "Error at pc=0:392:\nUnknown value for memory cell at address 12:0.\nCairo traceback (most recent call last):\nUnknown location (pc=0:534)\nUnknown location (pc=0:468)"}

Possible Solution

Steps to Reproduce

(nonce,) = keeper_contract.functions["get_nonce"].call_sync()
task_address_felt = int(task["address"], 16)
args, signature = get_account_message_args_sig(keeper_address, registry, "executeTask", [task_address_felt], nonce, key)
unsigned_invocation = keeper_contract.functions["execute"].prepare(*args)

# This is where the error occurs
estimation = unsigned_invocation.estimate_fee_sync()

# This normally runs perfectly fine if I don't do gas estimation for all these transactions that are failing with `estimate_fee`
invocation = unsigned_invocation.invoke_sync(signature=signature, max_fee=0)

FYI - I’m using an older version of an account contract to issue transactions but I’m assuming that this should not impact estimate fee as the other starknet.py apis are working fine?

Context (Environment)

I’ve been using the excellent starknet.py library to power Yagi Keepers (http://www.yagi.fi/automation). I’m trying to upgrade keepers now to use fees on testnet before they are officially mandated.

Detailed Description

Possible Implementation

[Pet3ris]

That fixed it thanks (and makes sense)!

[cptartur]

Are you providing the same signature to Contract.estimate_fee() as you’d be using in Contract.invoke()? It’s

# create my_signature signature somehow
estimate = my_invoke.estimate_fee_sync(signature=my_signature)