I am trying to use aws encryption sdk in a NestJS application, the next code source shows the implementation.

import { Controller, Get } from '@nestjs/common';
import {KmsKeyringNode, encrypt} from '@aws-crypto/client-node'


@Controller('encryption')
export class EncryptionController {
  // constructor() {}
  @Get()
  async crypt() {
    const generatorKeyId = "generatior key";
    const masterKeyId = "master key id";
    const keyring = new KmsKeyringNode({keyIds:[masterKeyId], generatorKeyId: generatorKeyId});
    const plainText = "My passwords for senstive data";
    const context = {
      accountId: "100",
      purpose: "youtube demo",
      country: "Sri Lanka"
    };
    const { result } = await encrypt(keyring, plainText, { encryptionContext: context });
    console.log(result)


  }

}

but when I execute a request to see the result of my implementation I receive the next error

Error: connect EHOSTUNREACH 169.254.169.254:80
      at TCPConnectWrap.afterConnect [as oncomplete] (net.js:1128:14) {
    message: 'Missing credentials in config, if using AWS_CONFIG_FILE, set AWS_SDK_LOAD_CONFIG=1',
    errno: 'EHOSTUNREACH',
    code: 'CredentialsError',
    syscall: 'connect',
    address: '169.254.169.254',
    port: 80,
    time: 2020-06-09T11:41:47.638Z,
    originalError: {
      message: 'Could not load credentials from any providers',
      errno: 'EHOSTUNREACH',
      code: 'CredentialsError',
      syscall: 'connect',
      address: '169.254.169.254',
      port: 80,
      time: 2020-06-09T11:41:47.638Z,
      originalError: {
        message: 'EC2 Metadata roleName request returned error',
        errno: 'EHOSTUNREACH',
        code: 'EHOSTUNREACH',
        syscall: 'connect',
        address: '169.254.169.254',
        port: 80,
        time: 2020-06-09T11:41:47.637Z,
        originalError: [Object]
      }
    }
  }

However I copy a nodejs script from this tutorial to see if it works with my aws sdk set up and I did not receive any error, also if a execute aws kms encryption methods in the cli I hadn't any error.

I tried to export AWS_SDK_LOAD_CONFIG=1 variable how I saw in other similar errors.

Does anyone know what's going on?