ClassifyPixels modual error

Dear Ilastik users and developers,
I am trying to analyze plant seed fluorescence. Luckily, there is a published pipeline called Meioseed ( developed by CellProfiler 2.2.1. In the step of ClassifIyPixels, I should develop a new classifer file using Ilastik 0.5.12.
Then I meet a problem at this step showing as the screenshot when runing in CellProfiler. Problems may happen in the step of object prediction using Ilastik. My Ilastik output Classfier file is just about 2Mb in size, comparing with the 7~181Mb Classfier file of Meioseed.

Thank you and I am looking forward to hearing from you.
PS: Question is also asked in the CellProfiler community.