[BUG] Cannot Train agents when using any knowledge source.

[karolvargas]

Description

Just using the base project from create crew CLI command and using OpenAI API key I am able to train and test my agents just fine. When I add knowledge sources of type JSON I do get a pydantic error from a dependency that I cannot fix. Simply importing the package will fail to train the agent. It will run the crew fine however. Is this intentional? As I do not see anyplace in the documentation for training that that is the case.

Steps to Reproduce

1. follow create crew instructions
2. change nothing
3. Add knowledge source to agent using default user_preference.txt
4. try to train model

Expected behavior

Ability to train on sample data

Screenshots/Code snippets

macOS Sequoia

Operating System

Other (specify in additional context)

Python Version

3.11

crewAI Version

0.95.0

crewAI Tools Version

0.25.8

Virtual Environment

Venv

Evidence

`crewai train -n 1
Training the Crew for 1 iterations
Traceback (most recent call last):
File "/path/src/tf_jits/main.py", line 36, in train
TfJits().crew().train(n_iterations=int(sys.argv[1]), filename=sys.argv[2], inputs=inputs)
File "/path/.venv/lib/python3.11/site-packages/crewai/crew.py", line 491, in train
train_crew = self.copy()
^^^^^^^^^^^
File "/path/.venv/lib/python3.11/site-packages/crewai/crew.py", line 1012, in copy
cloned_agents = [agent.copy() for agent in self.agents]
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/path/.venv/lib/python3.11/site-packages/crewai/crew.py", line 1012, in
cloned_agents = [agent.copy() for agent in self.agents]
^^^^^^^^^^^^
File "/path/.venv/lib/python3.11/site-packages/crewai/agents/agent_builder/base_agent.py", line 265, in copy
copied_agent = type(self)(**copied_data, llm=existing_llm, tools=self.tools)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/path/.venv/lib/python3.11/site-packages/pydantic/main.py", line 214, in init
validated_self = self.pydantic_validator.validate_python(data, self_instance=self)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
TypeError: Can't instantiate abstract class BaseKnowledgeSource with abstract methods add, validate_content

During handling of the above exception, another exception occurred:`

Possible Solution

None

Additional context

None

[phuang07]

@karolvargas I encountered this issue today, wondering if you have solution for this.

[karolvargas]

Was never able to figure it out 😢

[karolvargas]

Maybe someone else can look at it