---
page_type: error
code: 52111
message: "52111: GCM/FCM unknown error"
level: ERROR
product: Notifications
---

## Error - 52111

### GCM/FCM unknown error

#### Possible Causes

- Unknown GCM/FCM error.

#### Possible Solutions

- If the problem persists, contact [customer support](https://www.twilio.com/help/contact) and provide the time of the error and details about the requests that are failing.