Describe the bug

When using a very basic Agent to test functionality, after adding the stopping_condition as a string to the Agent() class construction, I see the error shown in the issue title.

To Reproduce

This is the Agent code:

dumb_agent = Agent(agent_name='dumb-tester',
                   agent_description=('does dumb things'),
                   llm=get_groq_llm(),
                   max_loops=10,
                   verbose=True,
                   stopping_condition="finish")

This is how I run it:

dumb_agent.run('make me a linked in post about machine learning. it can only be 240 chars. output the text and the # of chars used. provide detailed reasoning why you chose the wording for this post.')

Despite a successful run on the first "loop," the agent runs to the maximum loop number because there's no stopping condition.