Langsmith evaluate issue

[palaklanger]

Need some help please.
I've a model API that can be triggered only 3 times a minute. I'm trying to evaluate that model using langsmith evaluators. I'm getting error or null in the output answer when I'm trying to run evaluation using langsmith .

results=evaluate(
LLMPredict,
data=dataset_name,
evaluators=[qa_evaluator,cot_qa_evaluator],
experiment_prefix="gpt-4o-mini, baseline",
description="Testing the baseline system.",
max_concurrency=1
)

Please help.