Hello,
I was trying to use the gaussian backend as in the GBS tutorial (https://pennylane.ai/qml/demos/tutorial_gbs.html) but I’m getting the following error:
ContextualVersionConflict: (numba 0.45.1 (c:\users\kannan\anaconda3\lib\site-packages), Requirement.parse(‘numba>=0.49.1’), {‘thewalrus’})
How can I fix this? Both Pennylane and StrawberryFields have been updated to the latest version.
Hi @kannan_v,
That is odd! 
Did you install PennyLane and Strawberry Fields via pip install pennylane strawberryfields? Fresh installs would generally have to pull a greater version of numba than that, so wondering what it could come down to.
You could run pip install numba --upgrade as a fix to update the numba version that you have.
Let us know how this works out! 
Hello @antalszava,
Thank very you for the suggestion.
When I do tried to update numba, I was faced with this error:
ERROR: Cannot uninstall ‘llvmlite’. It is a distutils installed project and thus we cannot accurately determine which files belong to it which would lead to only a partial uninstall.
This was then solved by giving the --user tag to the command as:
pip install numba --upgrade --user and that solved the issue!
Now I’m able to use the Strawberry Fields gaussian backend 