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-WIP
+
+# Errors
+
+All errors returned from UberAuth will be of type UberAuthError. See the tables below for information on specific errors.
+
+## UberAuthError
+| Error | Associated Value | Description |
+| ----- | ------------ | ----------- |
+| UberAuthError.cancelled | - | The authentication flow was aborted before completion. |
+| UberAuthError.couldNotOpenApp(UberApp) | UberApp | The SDK failed to open the Uber client app. The associated value indicates which app the SDK attempted to open. |
+| UberAuthError.existingAuthSession | - | An attempt to start an  authentication session was made while another session was in progress. |
+| UberAuthError.invalidAuthCode | - | The authorization code was not found or is malformed. |
+| UberAuthError.invalidResponse | - | The response url could not be parsed. |
+| UberAuthError.invalidRequest(String) | Request url | The auth request could not be built. The associated value indicates which request failed. |
+| UberAuthError.oAuth(OAuthError) | OAuthError | An OAuth standard error occurred. See [OAuthError](#oautherror) for more information on the associated error. |
+| UberAuthError.other(Error) | Error | An unknown error occurred. |
+| UberAuthError.serviceError | - | An error occurred when making a network request. |
+
+## OAuthError
+Standard errors, as specified in [section-4.1.2.1](https://datatracker.ietf.org/doc/html/rfc6749#section-4.1.2.1) of the OAuth 2.0 Authorization Framework.
+
+| Error | String Value | Description |
+| ----- | ------------ | ----------- |
+| OAuthError.invalidRequest | invalid_request | The request is missing a required parameter, includes an invalid parameter value, includes a parameter more than once, or is otherwise malformed. |
+| OAuthError.unauthorizedClient | unauthorized_client | The client is not authorized to request an authorization code using this method. |
+| OAuthError.accessDenied | access_denied | The resource owner or authorization server denied the request. |
+| OAuthError.unsupportedResponseType | unsupported_response_type | The authorization server does not support obtaining an authorization code using this method. |
+| OAuthError.invalidScope | invalid_scope | The requested scope is invalid, unknown, or malformed. |
+| OAuthError.serverError | server_error | The authorization server encountered an unexpected condition that prevented it from fulfilling the request. (This error code is needed because a 500 Internal Server Error HTTP status code cannot be returned to the client via an HTTP redirect.) |
+| OAuthError.temporarilyUnavailable | temporarily_unavailable | The authorization server is currently unable to handle the request due to a temporary overloading or maintenance of the server.  (This error code is needed because a 503 Service Unavailable HTTP status code cannot be returned to the client via an HTTP redirect.) |