There are 4 piplines in the example. In “ExampleIlluminationCorrection_Example1_AllMethod” pipeline it shows following error,
For reference CP version 3.1.8 & OS is ubuntu,

I request the concerned team to update the example pipeline in the webpage.
This issue is also with reference to a forum question,
https://forum.image.sc/t/error-while-processing-correctilluminationcalculate/30053/2