langchainjs: Network Error in `ConversationChain`

I’m getting the following axios error when calling my ConversationChain

Error

"Error: Network Error\n    at createError (webpack-internal:///(api)/./node_modules/langchain/dist/util/axios-fetch-adapter.js:316:19)\n    at getResponse (webpack-internal:///(api)/./node_modules/langchain/dist/util/axios-fetch-adapter.js:197:16)\n    at async fetchAdapter (webpack-internal:///(api)/./node_modules/langchain/dist/util/axios-fetch-adapter.js:174:18)"

Implementation

const history = messages.map(({ agent, message }) =>
    agent === "ai" ? new AIChatMessage(message) : new HumanChatMessage(message)
  );

  const memory = new BufferMemory({
    memoryKey: "history",
    chatHistory: new ChatMessageHistory(history),
    returnMessages: true,
  });

  const llm = new ChatOpenAI({
    temperature: 0,
  });

  const prompt = ChatPromptTemplate.fromPromptMessages([
    SystemMessagePromptTemplate.fromTemplate(
      DEFAULT_PROMPT_TEMPLATE
    ),
    new MessagesPlaceholder("history"),
    HumanMessagePromptTemplate.fromTemplate("{message}"),
  ]);

  const chain = new ConversationChain({
    memory,
    prompt,
    llm,
  });

  try {
    response.status(200).json({
      success: true,
      data: await chain.call({
        message,
      }),
      agent: "ai",
    });
  } catch (error) {
    console.log(error);
    response.status(500).json({ success: false, error });
  }