Seaquel
SQL Server error code

SQL Server error 4923

SQL Server raises error 4923 at severity 16, which marks a problem with the query or data that you can correct.

ALTER TABLE DROP COLUMN failed because '%.*ls' is the only data column in table '%.*ls'. A table must have at least one data column.
Msg4923
Severity16
Group4000–4999

Source: Database Engine events and errors