ValueError: unsupported pickle protocol: 5 while ensemble=True

Hi,

I am trying to use ensemble method while training a dataset as below-


The training was fine but in the end of the following line- `[flaml.automl: 08-12 12:34:01] {3407} WARNING - Using passthrough=False for ensemble because the data contain categorical features.`

I am getting below -


And then the following error occurred-




Without ensemble, I was able to complete the training.

My dataset info is as below-



Please help me to resolve this issue.