AssertionError: Training And / Or Test Set Is Empty, Verify that training / test split is correctly set in split.csv

[system]

Pipeline fails with "Training and / or test set is empty, verify that training / test split is correctly set in split.csv" .

Issue Description

Pipeline fails with:

File "", line 140, in train
File "", line 139, in __init__
File "", line 26, in __init__
File "", line 527, in preprocess_data
AssertionError: Training and / or test set is empty, verify that training / test split is correctly set in split.csv

Root Cause: This can occur when the file names in the dataset folder are too long. There may be other causes for this issue.


Diagnosing / Resolving Steps

1. Look at the dataset and check to see if there are any files with name greater than 260 characters
2. If there is a file name that is longer than 260, the file name needs to be reduced and any references to it need to be changed to the updated name
3. Other causes could be that the wrong folder was selected for the pipeline
4. If the above does not resolve the issue, raise a ticket with UiPath.