Seaquel
SQL Server error code

SQL Server error 1734

SQL Server raises error 1734 at severity 16, which marks a problem with the query or data that you can correct.

Cannot create the sparse column set '%.*ls' in the table '%.*ls' because the table already contains one or more sparse columns. A sparse column set cannot be added to a table if the table contains a sparse column.
Msg1734
Severity16
Group1000–1999

Source: Database Engine events and errors