Cannot find package '@aws-sdk/client-scheduler error

Hello,

this minimal Nodejs 18 lambda (from https://docs.aws.amazon.com/AWSJavaScriptSDK/v3/latest/clients/client-scheduler/index.html)

import { SchedulerClient, CreateScheduleCommand } from "@aws-sdk/client-scheduler";

export const handler = async(event) => {
    // TODO implement
    const response = {
        statusCode: 200,
        body: JSON.stringify('Hello from Lambda!'),
    };
    return response;
};

leads to this error:

{ "errorType": "Error", "errorMessage": "Cannot find package '@aws-sdk/client-scheduler' imported from /var/task/index.mjs", "trace": [ "Error [ERR_MODULE_NOT_FOUND]: Cannot find package '@aws-sdk/client-scheduler' imported from /var/task/index.mjs", " at new NodeError (node:internal/errors:393:5)", " at packageResolve (node:internal/modules/esm/resolve:865:9)", " at moduleResolve (node:internal/modules/esm/resolve:958:20)", " at moduleResolveWithNodePath (node:internal/modules/esm/resolve:909:12)", " at defaultResolve (node:internal/modules/esm/resolve:1173:79)", " at nextResolve (node:internal/modules/esm/loader:163:28)", " at ESMLoader.resolve (node:internal/modules/esm/loader:841:30)", " at ESMLoader.getModuleJob (node:internal/modules/esm/loader:424:18)", " at ModuleWrap.<anonymous> (node:internal/modules/esm/module_job:76:40)", " at link (node:internal/modules/esm/module_job:75:36)" ] }

How to fix it?

Thanks