Solid cutting issue with some shapes

[generein]

I want to cut one shape with another, but run into an error.

vol1 = paramak.RotateCircleShape(a1,points=[(R,0,0,"straight")]
vol2  = paramak.RotateCircleShape(a1+a2,points=[(R,0,0,"straight")]
vol3 = paramak.utils.cut_solid(vol2,vol1)

The error is as follows:

Traceback (most recent call last):
  File "<path-to-anaconda>/envs/paramak_env/lib/python3.8/site-packages/paramak/utils.py", line 287, in cut_solid
    solid = solid.cut(cutter.solid)
TypeError: 'NoneType' object is not callable

Printing the type of vol1 and vol2 shows them correctly as <class 'paramak.parametric_shapes.rotate_circle_shape.RotateCircleShape'>

Also happens for e.g. CenterColumnShieldCylinder and whether I use cut_solid or intersect_solid (from paramak.utils) and cut or intersect (from CQ directly).