# Rlp error - ethereum\_requirements

**URL:** <https://community.blockcerts.org/t/rlp-error-ethereum-requirements/1769>\
**Category:** Support\
**Created:** [March 8, 2019, 12:18am UTC](https://community.blockcerts.org/t/rlp-error-ethereum-requirements/1769 "2019-03-08T00:18:04Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Mn3yoni](https://avatars.discourse-cdn.com/v4/letter/m/9fc348/32.png) [@Mn3yoni](https://community.blockcerts.org/u/Mn3yoni)\
**Post date:** [March 8, 2019, 12:18am UTC](https://community.blockcerts.org/t/rlp-error-ethereum-requirements/1769/1 "2019-03-08T00:18:04Z")

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hallo  
I have an error please help me, and I did not use Ducker just python  
the operating system: Ubuntu

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(my\_env) hanaa@hanaa:~/cert-issuer$ cert-issuer -c /home/hanaa/cert-issuer/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\_ropsten chain  
Traceback (most recent call last):  
File “/home/hanaa/my\_env/bin/cert-issuer”, line 11, in   
load\_entry\_point(‘cert-issuer==2.0.15’, ‘console\_scripts’, ‘cert-issuer’)()  
File “/home/hanaa/my\_env/lib/python3.7/site-packages/cert\_issuer-2.0.15-py3.7.egg/cert\_issuer/ **main**.py”, line 17, in cert\_issuer\_main  
issue\_certificates.main(parsed\_config)  
File “/home/hanaa/my\_env/lib/python3.7/site-packages/cert\_issuer-2.0.15-py3.7.egg/cert\_issuer/issue\_certificates.py”, line 31, in main  
from cert\_issuer.blockchain\_handlers import ethereum  
File “/home/hanaa/my\_env/lib/python3.7/site-packages/cert\_issuer-2.0.15-py3.7.egg/cert\_issuer/blockchain\_handlers/ethereum/ **init**.py”, line 9, in   
from cert\_issuer.blockchain\_handlers.ethereum.signer import EthereumSigner  
File “/home/hanaa/my\_env/lib/python3.7/site-packages/cert\_issuer-2.0.15-py3.7.egg/cert\_issuer/blockchain\_handlers/ethereum/signer.py”, line 1, in   
import rlp  
ModuleNotFoundError: No module named ‘rlp’

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<div class="post-metadata">

**Author:** ![aronning](https://avatars.discourse-cdn.com/v4/letter/a/47e85d/32.png) [@aronning](https://community.blockcerts.org/u/aronning)\
**Post date:** [March 8, 2019, 3:58pm UTC](https://community.blockcerts.org/t/rlp-error-ethereum-requirements/1769/2 "2019-03-08T15:58:03Z")

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I see you’re running in a virtual environment. make sure you have rlp installed in this environment, and make sure that you’ve ran the cert issuer install for ethereum mode.