Seaquel
SQL Server error code

SQL Server error 5256

SQL Server raises error 5256 at severity 16, which marks a problem with the query or data that you can correct.

Table error: alloc unit ID %I64d, page %S_PGID contains an incorrect page ID in its page header. The PageId in the page header = %S_PGID.
Msg5256
NameDBCC4_INCORRECT_PAGE_ID_IN_HEADER_NO_METADATA
Severity16
Group5000–5999

What it means

The page header of page P_ID1 contains an incorrect page ID, P_ID2.

Source: Database Engine events and errors