# Error in validating certificate using cer\_verifier on testnet

**URL:** <https://community.blockcerts.org/t/error-in-validating-certificate-using-cer-verifier-on-testnet/543>\
**Category:** Support\
**Created:** [November 15, 2017, 2:06pm UTC](https://community.blockcerts.org/t/error-in-validating-certificate-using-cer-verifier-on-testnet/543 "2017-11-15T14:06:36Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![d.hussain](https://avatars.discourse-cdn.com/v4/letter/d/4af34b/32.png) [@d.hussain](https://community.blockcerts.org/u/d.hussain)\
**Post date:** [November 15, 2017, 2:06pm UTC](https://community.blockcerts.org/t/error-in-validating-certificate-using-cer-verifier-on-testnet/543/1 "2017-11-15T14:06:36Z")

</div>

RROR:root:Error looking up transaction\_id with url=http://api.blockcypher.com/v1/btc/test3/txs/3bd15d4ffdc7e4f9bf7882e5b7349b24ac4949d104a08f8fe9243cc9e22525e5?limit=100, status\_code=404  
WARNING:root:Error looking up transaction, trying more connectors  
WARNING:root:Error looking up transaction, trying more connectors  
Traceback (most recent call last):  
File “[verifier.py](http://verifier.py)”, line 59, in   
result = verify\_certificate\_file(’…/tests/data/a7194edb-6fd8-4877-82b9-babe1f2066d2.json’)  
File “[verifier.py](http://verifier.py)”, line 48, in verify\_certificate\_file  
result = verify\_certificate(certificate\_model, options)  
File “[verifier.py](http://verifier.py)”, line 26, in verify\_certificate  
transaction\_info = connector.lookup\_tx(certificate\_model.txid)  
File “/usr/local/lib/python2.7/dist-packages/cert\_verifier/connectors.py”, line 85, in lookup\_tx  
raise InvalidTransactionError(exceptions)  
cert\_verifier.errors.InvalidTransactionError: [InvalidTransactionError(u’error looking up transaction\_id=3bd15d4ffdc7e4f9bf7882e5b7349b24ac4949d104a08f8fe9243cc9e22525e5’,), JSONDecodeError(‘Expecting value: line 1 column 1 (char 0)’,)]  
root@ip-10-44-1-109:/u01/blockchain-certificates/cert-verifier/cert\_verifier#

although transaction “3bd15d4ffdc7e4f9bf7882e5b7349b24ac4949d104a08f8fe9243cc9e22525e5” is already available and confirmed on testnet

Any help will be much appreciated.

Regards,  
Danish