Now type :
ls
Make sure you’re in the same directory as cdk.json (cdk command will fail if not)
cd .. for going back the previous directory

Now type:
cdk synth BucketDeploymentStack

We have synthesizing the deployment stack but it still hasn’t developed yet, to do that we’ll type:
cdk deploy BucketDeploymentStack
If ask for deploy changes just press y (yes).

If it successfully deployed, the result should be like this:

You could use to upgrade cdk to latest version:
npm install -g aws-cdk