Cannot find module aws-sdk client-sns

Question

I am getting this error when calling my lambda.

"errorType": "Runtime.ImportModuleError", "errorMessage": "Error: Cannot find module '@aws-sdk/client-sns'\nRequire stack:\n- /var/task/handler.js\n- /var/runtime/UserFunction.js\n- /var/runtime/index.js", "trace": [ "Runtime.ImportModuleError: Error: Cannot find module '@aws-sdk/client-sns'",

import * as AWS from '@aws-sdk/client-sns';
import { JamaSnsMessage } from './models/jama';
import { region, snsTopicArn } from './utils/constants';
import { log } from './utils/logger';

const client = new AWS.SNS({ region });

/**
 * Publishes given SNS formatted Jama items to SNS topic
 *
 * @param {JamaSnsMessage[]} items
 */
export const publishItems = async (items: JamaSnsMessage[]): Promise<void> => {
  if (!items || items.length <= 0) {
    return;
  }

  for (const item of items) {
    const params = {
      /* eslint-disable */
      MessageStructure: 'json',
      Message: JSON.stringify(item),
      TopicArn: snsTopicArn,
      /* eslint-enable */
    };
    log.info(`Sending jama item: ${JSON.stringify(item)} to sns`);
    await send(params);
  }
};

export const send = async (params: AWS.PublishInput): Promise<void> => {
  try {
    const data = await client.send(new AWS.PublishCommand(params));
    log.info(`Item: ${JSON.stringify(params)} was published with id: ${data.MessageId}`);
  } catch (error) {
    log.error(`Error while publishing message ${JSON.stringify(params)}. Cause: ${error}`);
  }
};