Missing required argument Terraform Origin: Platform & cloud OSI layer 7 · Application Last updated 5 Nov 2026

Terraform: Error: Missing required argument — The argument "ami" is required, but no definition was found

A resource/module block lacks an argument the schema requires.

Exact message you may see Error: Missing required argumentThe argument "ami" is required, but no definition was foundError: Missing required argument The argument "region" is requiredError: Insufficient ingress blocksError: Missing required argument: The argument "name" is required
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Seen on: Terraform

Meaning

Add the required argument (the message names it), or if it's a module input add the variable. Remember provider-level required arguments can come from environment variables (AWS_REGION) only for some. For nested blocks: "Insufficient x blocks" means a required block count isn't met.

Common causes

  • Argument omitted
  • Module variable has no default and wasn't passed
  • Required nested block missing (Insufficient)
  • Conditional logic leaving it unset
  • Provider version made an optional argument required

⚡ Quick fix

  1. Add the argument shown
  2. Pass the module variable or add a default
  3. Check the provider docs for required arguments

Detailed fix by platform

Terraform

  1. terraform validate lists all missing arguments

How to diagnose

  1. Argument — Which?
  2. Module — Variable passed?
  3. Provider — Version change?

🔧 Still not fixed?

Many errors look alike. If the steps above didn’t solve it, one of these is probably what you’re facing:

Where this error sits

Origin: Platform & cloud. Errors that are often confused with or caused by this one (click to open):

Duplicate resource configuration / variable declaration — Terraform: Error: Duplicate resource "aws_s3_bucket" configuration — A aws_s3_bucket resource named "logs" was already declared at main.tf:1 (Terraform)Duplicate resource co…Invalid AWS Region — Terraform: Error: Invalid AWS Region: us-east-3 / Error: configuring Terraform AWS Provider: validating provider credentials: operation error STS: GetCallerIdentity (Terraform)Invalid AWS RegionInvalid character / Argument or block definition required — Terraform: Error: Invalid character — This character is not used within the language / Error: Argument or block definition required (Terraform)Invalid character / A…Invalid value for input variable — Terraform: Error: Invalid value for variable — "instance_type" must be a t3 type / The given value is not suitable for var.x declared at variables.tf:1,1-17: string required (Terraform)Invalid value for inp…No valid credential sources found (AWS provider) — Terraform: Error: No valid credential sources found — failed to refresh cached credentials, no EC2 IMDS role found / Error: configuring Terraform AWS Provider: no valid credential sources (Terraform)No valid credential s…No value for required variable — Terraform: Error: No value for required variable — The root module input variable "region" is not set, and has no default value (Terraform)No value for required…Unsupported argument: An argument named "x" is not expected here — Terraform: Error: Unsupported argument — An argument named "enable_foo" is not expected here (Terraform)Unsupported argument:…Unsupported block type: Blocks of type "x" are not expected here — Terraform: Error: Unsupported block type — Blocks of type "versioning" are not expected here (Terraform)Unsupported block typ…Missing r…

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