Clone Email Response Error

Guys, could you please provide a solution? 
Can't clone some of our emails. 

**Request:**

```
POST https://xxx.mktorest.com/rest/asset/v1/email/xxx/clone.json?access_token=xxx

&name=xxx - [it-it]&folder={"id":14,"type":"Folder"}
```

**Response:**

```
{"requestId":"12caa#1636d21b670","success":false,"errors":[{"code":"611","message":"System error"}]}
```