Seaquel
SQL Server error code

SQL Server error 5512

SQL Server raises error 5512 at severity 16, which marks a problem with the query or data that you can correct.

Error 0x%x (%ls) was encountered while directory '%.*ls' was being truncated.
Msg5512
NameFS_TRUNCATEDIR_FAILED
Severity16
Group5000–5999

What it means

The truncate operation failed.

Source: Database Engine events and errors