Update documentation with contents by twrnh

content/en/entities/error.md

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+---
+title: Error
+description: Represents an error message.
+menu:
+  docs:
+    parent: entities
+---
+
+## Example
+
+```javascript
+{
+  "error": "invalid_grant",
+  "error_description": "The provided authorization grant is invalid, expired, revoked, does not match the redirection URI used in the authorization request, or was issued to another client."
+}
+```
+
+{{< hint style="info" >}}
+**The most important part of an error response is the HTTP status code.** Standard semantics are followed. The body of an error is a JSON object containing more information, if available.
+{{< /hint >}}
+
+## Required attributes
+
+### `error`
+
+**Description:** The error message.
+**Type:** String
+**Version history:** Added in 0.6.0
+
+## Optional attributes
+
+### `error_description`
+
+**Description:** A longer description of the error, mainly provided with the OAuth API.
+**Type:** String
+**Version history:** Added in 0.6.0
+
+## Possible reasons
+
+### 401 - Unauthorized
+
+#### require\_authenticated\_user!
+
+Error: This API requires an authenticated user. Appears when the instance is in secure mode, which disables all public use of API methods.
+
+### 403 - Forbidden
+
+#### current\_user.disabled?
+
+Error: Your login is currently disabled. Appears when the OAuth token's authorized user has had their account disabled by a moderator.
+
+#### !current\_user.confirmed?
+
+Error: Your login is missing a confirmed e-mail address. Appears when the email address associated with the OAuth token's authorized user's account has not yet been confirmed.
+
+#### !current\_user.approved?
+
+Error: Your login is currently pending approval. Appears when the OAuth token's authorized user has signed up on an instance with approval-required registrations, and the user has not yet had their account approved by a moderator.
+
+### 404 - Not Found
+
+#### RecordNotFound
+
+Error: Record not found. Appears when an entity record does not exist, or the authorized user is not within the audience of a private entity.operates on a user.
+
+### 422 - Unprocessable Entity
+
+#### RecordInvalid
+
+Error: {string}. May appear when entity creation failed.
+
+#### RecordNotUnique
+
+Error: Duplicate record. Appears when you are trying to pin an account or status that is already pinned.
+
+#### !current\_user
+
+Error: This method requires an authenticated user. Appears when using an OAuth token without an authorized user \(or no token at all\), while trying to call an API method that requires a user to be processed.
+
+## See also
+
+{{< caption-link url="https://github.com/tootsuite/mastodon/blob/master/app/controllers/api/base_controller.rb" caption="app/controllers/api/base\_controller.rb" >}}
+
+
+
+
+