Seaquel
SQL Server error code

SQL Server error 8126

SQL Server raises error 8126 at severity 16, which marks a problem with the query or data that you can correct.

Column "%.*ls.%.*ls" is invalid in the ORDER BY clause because it is not contained in an aggregate function and there is no GROUP BY clause.
Msg8126
Severity16
Group8000–8999

Source: Database Engine events and errors