[ethereum_ropsten] ModuleNotFoundError: No module named 'rlp'

Guy can anyone please help in this.
@Taibah @JustNET JustN @dannysuarez @jackblock @yosuke @lemoustachiste Anyone?
I am struck here for couple of days .

I tried after adding scrypt, in the Docker file.

Mentioned by @JustNET

but issue is still there.

My docker file looks like this -

(venv) bash-4.3# cat …/cert-issuer/Dockerfile
FROM seegno/bitcoind:0.13-alpine
MAINTAINER Kim Duffy “kimhd@mit.edu”

COPY . /cert-issuer
COPY conf_regtest.ini /etc/cert-issuer/conf.ini

RUN apk add --update
bash
ca-certificates
curl
gcc
gmp-dev
libffi-dev
libressl-dev
linux-headers
make
musl-dev
python
python3
libssl-dev
build-essential
python-dev
python3-dev
scrypt
tar
g++
libxslt-dev
&& python3 -m ensurepip
&& pip3 install --upgrade pip setuptools
&& mkdir -p /etc/cert-issuer/data/unsigned_certificates
&& mkdir /etc/cert-issuer/data/blockchain_certificates
&& mkdir ~/.bitcoin
&& echo $‘rpcuser=foo\nrpcpassword=bar\nrpcport=8332\nregtest=1\nrelaypriority=0\nrpcallowip=127.0.0.1\nrpcconnect=127.0.0.1\n’ > /root/.bitcoin/bitcoin.conf
&& pip3 install chainpoint>=0.0.2
&& sed -i.bak s/==1.0b1/>=1.0.2/g /usr/lib/python3./site-packages/merkletools-1.0.2-py3..egg-info/requires.txt
&& pip3 install /cert-issuer/.
&& rm -r /usr/lib/python*/ensurepip
&& rm -rf /var/cache/apk/*
&& rm -rf /root/.cache

ENTRYPOINT bitcoind -daemon && bash