Terraform plan execution errors

Error: undeclared resource

 terraform plan
╷
│ Error: Reference to undeclared resource
│
│   on main.tf line 9, in resource "aws_instance" "example":
│    9:   ami               = data.aws_ami.windows.id
│
│ A data resource "aws_ami" "windows" has not been declared in the root module.

No configuration files

terraform plan

Error: No configuration files 

Plan requires configuration to be present. Planning without a configuration
would mark everything for destruction, which is normally not what is desired.
If you would like to destroy everything, run plan with the -destroy option.
Otherwise, create a Terraform configuration file (.tf file) and try again.

Related terms

• Terraform: Hello_world.tf
• GitLab Preview of summary of terraform plan in Merge Requests https://about.gitlab.com/releases/2020/05/22/gitlab-13-0-released/#review-summary-of-terraform-plan-in-merge-requests
• terraform validate
• terraform apply

See also

• terraform [untaint | fmt | apply |show | state | init | plan | console | output | validate | destroy | debug | import | providers | get | graph | workspaces | resource | login | -var-file | state mv | state pull | state push | state replace-provider | state rm | force-unlock | env | tfe | --version | remote-exec | delete on termination | deprecated commands | terraform --help]
• Terraform, OpenTofu, Terrakube.org, Installation, Terraform AWS, Terraform GCP, Terraform commands, Terraform Cloud, Terraform Enterprise (TFE), HCL, HIL, meta-arguments, providers, modules, resource, provisioners, data sources, backends: remote backends, examples, configuration files, state files, variables, types, Terraform Registry, conditionals: depends_on, functions, Blocks, dynamic blocks, errors, Terragrunt, Terraformer, Terratest, Terraform certifications, Terraform map type, Terraform Associate, Terraform: list type, TF_VAR_, TF_LOG, Terraform provider versioning, Terraform Style Conventions, Required version, Terraform plugin, Terraform Named Values, tags, Changelog, tfsec, tflint, Operators, Expressions: for, splat, Debugging, Namespaces, Terraform Landing Zones, CDKTF, Atmos