# Error: Invalid required_providers version constraint: "~> 3.0, < 4.0" is not a valid version constraint string

- **ID:** `terraform/invalid-required-providers-version-constraint`
- **Domain:** terraform
- **Category:** config_error
- **Verification:** ai_generated
- **Fix Rate:** 90%

## Root Cause

The version constraint syntax in required_providers is malformed or uses unsupported operators.

## Version Compatibility

| Version | Status | Introduced | Deprecated |
|---------|--------|------------|------------|
| Terraform v1.5.0 | active | — | — |
| Terraform v1.6.0 | active | — | — |
| Terraform v1.7.0 | active | — | — |

## Workarounds

1. **Use a single constraint without commas: `version = "~> 3.0"` or use multiple constraints with newlines: `version = [">= 3.0", "< 4.0"]`** (95% success)
   ```
   Use a single constraint without commas: `version = "~> 3.0"` or use multiple constraints with newlines: `version = [">= 3.0", "< 4.0"]`
   ```
2. **Correct the syntax to use a list: `version = [">= 3.0", "< 4.0"]` and run 'terraform init'** (95% success)
   ```
   Correct the syntax to use a list: `version = [">= 3.0", "< 4.0"]` and run 'terraform init'
   ```

## Dead Ends

- **Remove the version constraint entirely and run terraform init** — Without constraints, Terraform may install a newer incompatible provider version. (60% fail)
- **Use a comma instead of spaces between constraints: "~> 3.0,< 4.0"** — The comma is still invalid; Terraform requires spaces or newlines between constraints. (90% fail)
- **Wrap the constraint in double quotes inside the block** — The error is about the constraint string syntax, not quoting. (50% fail)