pylsl.pylsl.InternalError: an internal error on Linux

[tanvach]

I'm encountering this error when running lsl-viewer.py on Ubuntu 18.04 (64 bit):

pylsl.pylsl.InternalError: an internal error has occurred.

I traced it back to self.inlet.pull_chunk() method which for some reason is returning this error. Testing with a simple script using self.inlet.pull_sample() works fine.

This seems to be caused by the latest pylsl library (1.12.0), and installing previous version resolves the issue:

pip install -I pylsl==1.10.5

Suggestion to edit the guide to fix pylsl version.