Getting exceptions

Hello ,
       I'm trying to use mixup for one of university projects and I'm seeing the below expection when I use the mixup library provided by you.

iris_mix = mixup(iris_df)

An exception has occurred, use %tb to see the full traceback.

SystemExit: 1


I'm using the code as is from the example that you have posted in the github .

Thanks and Regards,
raghu