# Cert-issuer -c conf.ini Error **URL:** \ **Category:** Support\ **Created:** [August 2, 2023, 8:32am UTC](https://community.blockcerts.org/t/cert-issuer-c-conf-ini-error/3450 "2023-08-02T08:32:41Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![oto3](https://avatars.discourse-cdn.com/v4/letter/o/258eb7/32.png) [@oto3](https://community.blockcerts.org/u/oto3)\ **Post date:** [August 2, 2023, 8:32am UTC](https://community.blockcerts.org/t/cert-issuer-c-conf-ini-error/3450/1 "2023-08-02T08:32:41Z")
When I run the command I get the following error: What should I do? ```auto TypeError: CertificateV3Handler. __init__ () missing 1 required positional argument: 'app_config' ``` conf.ini ```auto issuing_address = 0x000000000000000000000000000000000000 verification_method = did:web:xxxxxxx.storage.googleapis.com#key-1 usb_name=. key_file=key_file.txt unsigned_certificates_dir=/Project/blockcerts/data/unsigned_certificates blockchain_certificates_dir=/Project/blockcerts/data/blockchain_certificates work_dir=/Project/blockcerts/data/work chain = ethereum_sepolia sepolia_rpc_url = https://eth-sepolia.g.alchemy.com/v2/ALO1O9NVB6XAs9pidhicAfAhZaLRwCKx no_safe_mode ``` ---
**Author:** ![lemoustachiste](https://avatars.discourse-cdn.com/v4/letter/l/7c8e57/32.png) [@lemoustachiste](https://community.blockcerts.org/u/lemoustachiste)\ **Post date:** [August 18, 2023, 7:06am UTC](https://community.blockcerts.org/t/cert-issuer-c-conf-ini-error/3450/2 "2023-08-18T07:06:24Z")
This looks like an error with Python rather than the library itself. Did you modify the code? You need to check why the app\_config arg is not passed / available to the function ---
**Author:** ![oto3](https://avatars.discourse-cdn.com/v4/letter/o/258eb7/32.png) [@oto3](https://community.blockcerts.org/u/oto3)\ **Post date:** [September 4, 2023, 5:37am UTC](https://community.blockcerts.org/t/cert-issuer-c-conf-ini-error/3450/3 "2023-09-04T05:37:30Z")
> It worked fine by setting chain to mockchain.Thanks. If I want to use the originally configured sepolia network, how should I configure it? I originally defined it like this: ```auto chain = ethereum_sepolia sepolia_rpc_url = https://eth-sepolia.g.alchemy.com/v2/ALO1O9NVB6XAs9pidhicAfAhZaLRwCKx ``` ---
**Author:** ![lemoustachiste](https://avatars.discourse-cdn.com/v4/letter/l/7c8e57/32.png) [@lemoustachiste](https://community.blockcerts.org/u/lemoustachiste)\ **Post date:** [September 4, 2023, 12:38pm UTC](https://community.blockcerts.org/t/cert-issuer-c-conf-ini-error/3450/4 "2023-09-04T12:38:03Z")
```auto issuing_address=0xyourissuingaddress chain=ethereum_sepolia ``` in pk\_issuer.txt: your private key ---
**Author:** ![oto3](https://avatars.discourse-cdn.com/v4/letter/o/258eb7/32.png) [@oto3](https://community.blockcerts.org/u/oto3)\ **Post date:** [September 5, 2023, 5:51am UTC](https://community.blockcerts.org/t/cert-issuer-c-conf-ini-error/3450/5 "2023-09-05T05:51:00Z")
Thank you for your reply. If you continue to specify “ethereum\_sepolia” in the “chain” field, the same error below will occur. ```auto 😭 cert-issuer -c conf.ini WARNING - Your app is configured to skip the wifi check when the USB is plugged in. Read the documentation to ensure this is what you want, since this is less secure INFO - This run will try to issue on the ethereum_sepolia chain Traceback (most recent call last): File "/Users/ogawaranaoki/.pyenv/versions/3.10.7/bin/cert-issuer", line 8, in sys.exit(cert_issuer_main()) File "/Users/ogawaranaoki/.pyenv/versions/3.10.7/lib/python3.10/site-packages/cert_issuer/ __main__.py", line 17, in cert_issuer_main issue_certificates.main(parsed_config) File "/Users/ogawaranaoki/.pyenv/versions/3.10.7/lib/python3.10/site-packages/cert_issuer/issue_certificates.py", line 30, in main certificate_batch_handler, transaction_handler, connector = ethereum.instantiate_blockchain_handlers(app_config) File "/Users/ogawaranaoki/.pyenv/versions/3.10.7/lib/python3.10/site-packages/cert_issuer/blockchain_handlers/ethereum/ __init__.py", line 64, in instantiate_blockchain_handlers certificate_handler=CertificateV3Handler(), TypeError: CertificateV3Handler. __init__ () missing 1 required positional argument: 'app_config' ``` The conf.ini that is set is below. ```auto verification_method=did:web:blockcerts-20230802.storage.googleapis.com#key-1 usb_name=. key_file=pk.txt unsigned_certificates_dir=/Users/ogawaranaoki/Project/blockcerts/data/unsigned_certificates blockchain_certificates_dir=/Users/ogawaranaoki/Project/blockcerts/data/blockchain_certificates work_dir=/Users/ogawaranaoki/Project/blockcerts/data/work issuing_address=0xEd098A14695cA7Eb019615C9370D136EdAABf236 chain=ethereum_sepolia sepolia_rpc_url=https://eth-sepolia.g.alchemy.com/v2/myalchemysepolianetkey no_safe_mode ``` If you specify mockchain for chain, it will succeed, but if you change it to ethereum\_sepolia, an app\_config error will occur. ---
**Author:** ![linear](https://avatars.discourse-cdn.com/v4/letter/l/90ced4/32.png) [@linear](https://community.blockcerts.org/u/linear)\ **Post date:** [October 4, 2023, 8:29am UTC](https://community.blockcerts.org/t/cert-issuer-c-conf-ini-error/3450/6 "2023-10-04T08:29:04Z")
I solved this by changing the “certificate\_handler=CertificateV3Handler()” to “certificate\_handler=CertificateV3Handler(app\_config)” in python3.10/site-packages/cert\_issuer/blockchain\_handlers/ethereum/ **init**.py ---
**Author:** ![oto3](https://avatars.discourse-cdn.com/v4/letter/o/258eb7/32.png) [@oto3](https://community.blockcerts.org/u/oto3)\ **Post date:** [October 6, 2023, 5:06am UTC](https://community.blockcerts.org/t/cert-issuer-c-conf-ini-error/3450/7 "2023-10-06T05:06:19Z")
Thanks so much!! ```auto certificate_handler=CertificateV3Handler(app_config) ``` After making this modification, it worked! @lemoustachiste Is this a bug in cert-issuer?