AWS Bedrock Agent调用InvokeAgentCommand出现Internal Server Exception问题

我使用Node.js及AWS SDK for JavaScript构建基于生成式AI的CLI聊天机器人，依托AWS Bedrock Agent实现功能。但无论在代码中还是AWS控制台测试环境，调用InvokeAgentCommand时均抛出「Internal Server Exception」错误。我已尝试为代理服务角色附加Bedrock全权限内联策略，但问题仍未解决，且该代理未使用知识库。

以下是我的代码：

import readline from "readline";
import { BedrockAgentRuntimeClient, InvokeAgentCommand } from "@aws-sdk/client-bedrock-agent-runtime";
import dotenv from "dotenv";
dotenv.config();

const client = new BedrockAgentRuntimeClient({
  region: "us-east-1",
  credentials: {
    accessKeyId: "XXXXXXXXXX",
    secretAccessKey: "XXXXXXXXX",
  },
});

const rl = readline.createInterface({
  input: process.stdin,
  output: process.stdout,
  prompt: "You: "
});

const agentId = "XXXXXXXX";
const agentAliasId = "XXXXXXXXX";
const sessionId = "cli-session-1";
 
console.log("🤖 Bedrock CLI Chatbot Initialized. Type your messages below:\n");
rl.prompt();

rl.on("line", async (line) => {
  const inputText = line.trim();
  if (!inputText) {
    rl.prompt();
    return;
  }

  const command = new InvokeAgentCommand({
    agentId,
    agentAliasId,
    sessionId,
    inputText,
    enableTrace: true,
  });

  try {
    const response = await client.send(command);
    const decoder = new TextDecoder();

    console.log("Bot: ");
    for await (const chunk of response.completion) {
      if (chunk.chunk?.bytes) {
        const text = decoder.decode(chunk.chunk.bytes, { stream: true });
        process.stdout.write(text); 
      }
    }
    console.log("\n");
  } catch (err) {
    console.error("❌ Error:", err.message);
  }


  rl.prompt();
}).on("close", () => {
  console.log("\n👋 Session ended.");
  process.exit(0);
});

控制台错误截图：
代码运行错误截图：

内容的提问来源于stack exchange，提问作者Sarimm Chaudhry