Seaquel
SQL Server error code

SQL Server error 3057

SQL Server raises error 3057 at severity 16, which marks a problem with the query or data that you can correct.

Invalid device name. The length of the device name provided exceeds supported limit (maximum length is:%d). Reissue the BACKUP statement with a valid device name.
Msg3057
Severity16
Group3000–3999

Source: Database Engine events and errors