AttributeError: 'str' object has no attribute 'setup'

[wasifmasood]

I keep on getting the following error. I have ray 2.5.0 and latest sklearn. Also tried 2.4.0 and lower versions of sklearn but no luck. Please guide here, I am dead stucked.

Job failed due to an application error, last available logs (truncated to 20,000 chars):
File "/home/rayuser/.local/lib/python3.8/site-packages/ray/tune/tune.py", line 1018, in run
runner.setup_experiments(
File "/home/rayuser/.local/lib/python3.8/site-packages/ray/tune/execution/trial_runner.py", line 305, in setup_experiments
self._callbacks.setup(**spec)
File "/home/rayuser/.local/lib/python3.8/site-packages/ray/tune/callback.py", line 357, in setup
callback.setup(**info)
AttributeError: 'str' object has no attribute 'setup'