# Fix Terraform error "Required 'compute.subnetworks.use'"  on Creating Vertex AI Workbench / Notebook

Fix: add the following principal to the network project or current project( depending on how your VPC topology)

[service-{project-number}@gcp-sa-notebooks.iam.gserviceaccount.com](mailto:service-742144183466@gcp-sa-notebooks.iam.gserviceaccount.com)

And add \`Compute Network User\` role