Apparently issues is due to warning in transformers 4.46.2 version with mismatch “Trainer.tokenizer is now deprecated. You should use Trainer.processing_class instead.”, reverted to 4.43.2 seems to be working, will try 4.45.2 now.
issue not resolved but getting it work fine with older version, hopefully, 4.46.2 arguments will be updated or resolved soon. @huggingface
Thanks to : Tokenizer deprecating in ORPO - #4 by John6666