cohere prompt driver won't return basic example

[kyleroche]

using default example prompt from cohere generate api docs, getting empty output

agent = Agent(
    prompt_driver=CoherePromptDriver(
        api_key="key here"
    ),
    #rulesets=[ruleset],
    memory=Memory()
)

result = agent.run("one upon a time in a land called")
print(result.output.to_text())