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# this package isn't allowed

It may fail to install a tool by the error `this package isn't allowed`.

e.g.

```console
$ tfcmt -v
FATA[0000] aqua failed aqua_version= env=darwin/arm64 error="validate the installed package for security: this package isn't allowed" program=aqua
```

## What does this error mean?

This error means your [Policy](/docs/reference/security/policy-as-code) forbids the package.
About Policy, please see [Policy as Code](/docs/reference/security/policy-as-code).

## How to solve the error

Please configure Policy.

- [Guides > Policy as Code](/docs/guides/policy-as-code)
- [Reference](/docs/reference/security/policy-as-code)
