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[Home](./index.md) &gt; [@firebase/auth](./auth.md) &gt; [MultiFactorError](./auth.multifactorerror.md)

## MultiFactorError interface

The error thrown when the user needs to provide a second factor to sign in successfully.

<b>Signature:</b>

```typescript
export interface MultiFactorError extends AuthError 
```
<b>Extends:</b> [AuthError](./auth.autherror.md)

## Remarks

The error code for this error is `auth/multi-factor-auth-required`<!-- -->.

## Example


```javascript
let resolver;
let multiFactorHints;

signInWithEmailAndPassword(auth, email, password)
    .then((result) => {
      // User signed in. No 2nd factor challenge is needed.
    })
    .catch((error) => {
      if (error.code == 'auth/multi-factor-auth-required') {
        resolver = getMultiFactorResolver(auth, error);
        multiFactorHints = resolver.hints;
      } else {
        // Handle other errors.
      }
    });

// Obtain a multiFactorAssertion by verifying the second factor.

const userCredential = await resolver.resolveSignIn(multiFactorAssertion);

```

## Properties

|  Property | Type | Description |
|  --- | --- | --- |
|  [operationType](./auth.multifactorerror.operationtype.md) | [OperationType](./auth.operationtype.md) | The type of operation (e.g., sign-in, link, or reauthenticate) during which the error was raised. |