IKFAST can not generate plugin when iktype = 'Translation3D'

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I am trying to use OpenRAVE ikfast to test it with panda and ur5 robot. Here are my environment information:

OS version: 18.04 Ubuntu, OpenRAVE version: 0.9.0, ROS version: melodic

Now I have generated successfully the ikfast plugin for both robot with iktype is 'Transform6D' by using inversekinematics module here (http://openrave.org/docs/latest_stabl...). However, it does not work for the iktype 'Translation3D'. The error is like following:

File "/home/geriatronics/.local/lib/python2.7/site-packages/sympy/polys/domains/pythonrationalfield.py", line 34, in from_sympy raise CoercionFailed("expected Rational object, got %s" % a) sympy.polys.polyerrors.CoercionFailed: expected Rational object, got oo

Does anyone have meet the above problem or have some suggestions for that?

Many thanks!