Getting the Error: net.imagej.ops.OpService' object has no attribute 'filter'

Hi, I am following the tutorial:

https://github.com/InsightSoftwareConsortium/itkwidgets/blob/9f748dd395f8d0714f8a3d9e00a6f748a6f0ee37/examples/ImageJImgLib2.ipynb

Everything works until the last step.

ij.op().filter().frangiVesselness(ij.py.to_java(vessels),
image_java,
[1, 1],
20)

This step gives the following error "net.imagej.ops.OpService' object has no attribute 'filter' ". I have tried debugging but I am unable to move past this error. I would really appreciate any help. Thank you!