backup.py: ModuleNotFoundError: No module named 'pyln.spec'

root@ubuntu:~# lightningd --encrypted-hsm
2021-12-04T16:51:03.763Z DEBUG   plugin-manager: started(18545) /usr/local/bin/../libexec/c-lightning/plugins/autoclean
2021-12-04T16:51:03.765Z DEBUG   plugin-manager: started(18546) /usr/local/bin/../libexec/c-lightning/plugins/bcli
2021-12-04T16:51:03.773Z DEBUG   plugin-manager: started(18547) /usr/local/bin/../libexec/c-lightning/plugins/fetchinvoice
2021-12-04T16:51:03.785Z DEBUG   plugin-manager: started(18548) /usr/local/bin/../libexec/c-lightning/plugins/funder
2021-12-04T16:51:03.792Z DEBUG   plugin-manager: started(18549) /usr/local/bin/../libexec/c-lightning/plugins/topology
2021-12-04T16:51:03.800Z DEBUG   plugin-manager: started(18550) /usr/local/bin/../libexec/c-lightning/plugins/keysend
2021-12-04T16:51:03.802Z DEBUG   plugin-manager: started(18551) /usr/local/bin/../libexec/c-lightning/plugins/offers
2021-12-04T16:51:03.818Z DEBUG   plugin-manager: started(18552) /usr/local/bin/../libexec/c-lightning/plugins/pay
2021-12-04T16:51:03.825Z DEBUG   plugin-manager: started(18553) /usr/local/bin/../libexec/c-lightning/plugins/txprepare
2021-12-04T16:51:03.834Z DEBUG   plugin-manager: started(18554) /usr/local/bin/../libexec/c-lightning/plugins/spenderp
2021-12-04T16:51:03.841Z DEBUG   plugin-manager: started(18555) /root/repos/plugins/backup/backup.py
Traceback (most recent call last):
  File "/root/repos/plugins/backup/backup.py", line 2, in <module>
    from pyln.client import Plugin
  File "/root/repos/lightning/contrib/pyln-client/pyln/client/__init__.py", line 3, in <module>
    from .gossmap import Gossmap, GossmapNode, GossmapChannel, GossmapNodeId
  File "/root/repos/lightning/contrib/pyln-client/pyln/client/gossmap.py", line 3, in <module>
    from pyln.spec.bolt7 import (channel_announcement, channel_update,
ModuleNotFoundError: No module named 'pyln.spec'
2021-12-04T16:51:04.035Z INFO    plugin-backup.py: Killing plugin: exited before replying to getmanifest

My installed versions/packages:

root@ubuntu:~# lightning-cli --version
v0.10.2

root@ubuntu:~# pip3 list | grep pyln
pyln-bolt7                    1.0.2.186
pyln-client                   0.9.3
pyln-proto                    0.10.1

I’m not sure what to do here; googling this brought up basically nothing.

[SimonVrouwe]

Traceback (most recent call last): File “/root/repos/plugins/backup/backup.py”, line 2, in <module> from pyln.client import Plugin File “/root/repos/lightning/contrib/pyln-client/pyln/client/init.py”, line 3, in <module> from .gossmap import Gossmap, GossmapNode, GossmapChannel, GossmapNodeId File “/root/repos/lightning/contrib/pyln-client/pyln/client/gossmap.py”, line 3, in <module> from pyln.spec.bolt7 import (channel_announcement, channel_update, ModuleNotFoundError: No module named ‘pyln.spec’

@v4w5gse65g874 I was able to reproduce your error once … but I also don’t understand it.

The requirements.txt for backup plugin shows pyln-client ~= 0.9.2, no other pyln-x.

After uninstalling all pyln-x (including bolts) with python3 -m pip uninstall and then reinstall with python3 -m pip install -r requirements.txt

Then the plugin runs fine without above error and python3 -m pip list shows only pyln-client

[chrisguida]

This was also happening to me on rebalance and summary. Do some requirements files need to be updated? Or possibly some Python wheels? Just installing the requirements files didn’t work for me:

pip install -r /usr/local/libexec/c-lightning/plugins/rebalance/requirements.txt …resulted in this:

# pip freeze
pyln-client==0.10.2.post1

a subsequent pip install -r /usr/local/libexec/c-lightning/plugins/summary/requirements.txt …resulted in this:

# pip freeze
certifi==2022.5.18.1
charset-normalizer==2.0.12
idna==3.3
packaging==21.3
pyln-client==0.10.2.post1
pyparsing==3.0.9
PySocks==1.7.1
requests==2.28.0
urllib3==1.26.9

Both plugins crashed until I ran: pip install -U pyln-proto pyln-bolt7

Not sure if pyln-proto is necessary, but pyln-bolt7 appears to be necessary, and missing from the requirements.txt files.