Exception when handling event "_start_run": TypeError: SVMLearner.initialize() missing 1 required positional argument: 'fl_ctx'

[AlexMarcoENG]

I'm getting this error when I try to run example sklearn-svm. basically, after confusing the three clients, I get:
SKLearnExecutor - ERROR - [identity=site-3, run=simulate_job]: Exception when handling event "_start_run": TypeError: SVMLearner.initialize() missing 1 required positional argument: 'fl_ctx'
2023-10-03 15:30:41,654 - SKLearnExecutor - ERROR - Traceback (most recent call last):
File "/home/user/NVFlare/nvflare-env/lib/python3.10/site-packages/nvflare/private/event.py", line 61, in fire_event
h.handle_event(event, ctx)
File "/home/user/NVFlare/nvflare-env/lib/python3.10/site-packages/nvflare/app_opt/sklearn/sklearn_executor.py", line 117, in handle_event
self.initialize(fl_ctx)
File "/home/user/NVFlare/nvflare-env/lib/python3.10/site-packages/nvflare/app_opt/sklearn/sklearn_executor.py", line 48, in initialize
self.learner.initialize(fl_ctx)
TypeError: SVMLearner.initialize() missing 1 required positional argument: 'fl_ctx'

and also:

SKLearnExecutor - ERROR - Traceback (most recent call last):
File "/home/user/NVFlare/nvflare-env/lib/python3.10/site-packages/nvflare/app_opt/sklearn/sklearn_executor.py", line 106, in execute
return self.train(current_round, global_params, fl_ctx)
File "/home/user/NVFlare/nvflare-env/lib/python3.10/site-packages/nvflare/app_opt/sklearn/sklearn_executor.py", line 68, in train
params, model = self.learner.train(current_round, global_param, fl_ctx)
File "/home/user/NVFlare/examples/advanced/sklearn-svm/workspaces/sklearn_svm_3_uniform_sklearn/simulate_job/app_site-3/custom/svm_learner.py", line 80, in train
(x_train, y_train, train_size) = self.train_data
TypeError: cannot unpack non-iterable NoneType object

I'm running it on my Ubuntu powershell in Windows 10.
Thanks a lot for your help

[YuanTingHsieh]

Hi @AlexMarcoENG

Thanks for the interest and the discussion!

Since you are running examples, please make sure the NVFlare version you installed MATCH the repo branch version.

Please provide more information:

1. Python version (python3 -V)
2. NVFlare version you installed (something like python3 -m pip list | grep 'nvflare')
3. NVFlare repo branch (git branch should show)

[AlexMarcoENG]

Dear Yuan,

thanks for your reply. here the answers:
Python version: 3.10.12
NVflare version: 2.3.5
Git branch: Main

[YuanTingHsieh]

@AlexMarcoENG thanks for the quick response.

Please use git branch 2.3 instead of main (git checkout 2.3) so that is consistent with the latest NVFlare 2.3.5 version.

[AlexMarcoENG]

Thanks a lot. It works now