My system:

OS: ubuntu 16.04
python version: 2.7

I am following the instructions from here : https://github.com/ethereum/pyethapp/wiki/Getting-Started to install pyethapp from Github. However when I tried to run pyethapp, it shows this error message:

"sorry, but this version only supports 100 named groups"
AssertionError: sorry, but this version only supports 100 named groups

I know this has something to deal particularly with my machine and regex but I am unable to solve it.


This is a recent bug in pycparser: https://github.com/pyca/cryptography/issues/3187. There are two workarounds you can try:

pip install pycparser==2.13

or if you don't want to downgrade the pycparser:

pip install cryptography --no-binary pycparser

  • Thanks for the reply. By running the first command, the previous error resolved(perhaps) but now I find a new assertion error for all peers when I run pyethapp. The error message I get now is the same error message that I mentioned secondly in link while installing pyethapp by PyPI. How to resolve this now :/ – shikhar mahajan Oct 6 '16 at 14:07

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