New JupyterLab visual debugger

Very exited to be able to use the new jupyter lab visual debugger:

But it doesn’t seem to be working in my fastai2 environment. Anybody else getting the following error?

SyntaxError                               Traceback (most recent call last)
File C:\Anaconda3\envs\fastai2\lib\, in parse:
Line 35:    return compile(source, filename, mode, PyCF_ONLY_AST)

SyntaxError: invalid syntax (<string>, line 18)
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The kernelspy extension for JupyterLab can be used to inspect the debug messages sent between the debugger UI and the kernel. To install it: jupyter labextension install jupyterlab-kernelspy snaptube vidmate